Sizes 18 and 20 sit at an awkward spot in most stores. They're often the top of a regular range and the start of a plus range, so the same body can wear an 18 in one brand and a 1X or 2X in the next, with very different cuts. I dress women in this size band often, and most of the work is about fit before fashion: where a waistband lands, how much room a jacket has across the back, whether a fabric skims or grips. The 25 outfits below are full looks for work, weekends, weddings and holidays, and with each one I've said what to check before you buy.
Where Size 18 and 20 Fall on the Size Charts
This size band is where shopping gets confusing, so I explain it to everyone before we look at clothes. Many brands use 18 or 20 as the top of a missy range, cut on a straight block made for a smaller frame and simply graded up. Plus ranges, often labelled 18W, 20W or 1X and 2X, are cut on a block with more room in the bust, hips and upper arms.
- A missy 18 can fit at the waist but pull at the bust and back. If that keeps happening, try the W or plus version of the same size.
- Letter sizes vary. In many brands 1X covers roughly 16 to 18 and 2X covers roughly 18 to 20, so read the measurement chart before choosing.
- Upper arm room is often the deciding measurement for jackets, blazers and fitted tops. If sleeves are tight, size by the arm and alter the body.
I always buy for the fullest measurement in fitted pieces. Taking in a waist is a quick job for a tailor; adding room across a bust usually isn't possible.
1. High-Waisted Jeans With A Flowy Blouse
High-waisted jeans are my starting point for a casual week. The test is to sit down in the fitting room: a good pair stays put at the back waist without a gap, and a poor one pulls down or digs in. Over them, a V-neck blouse in rayon or crepe, tucked so the drape sits loose over the tummy instead of clinging to it. A thin belt marks the waist, and pointed flats or low block heels finish the line. A structured crossbody and gold hoops make it a brunch or a casual Friday at work.
2. Floral Wrap Dress With Wedge Sandals
Wrap dresses are the dress I recommend most often at 18/20, because the tie lets you set the waist yourself instead of trusting a size chart. The V-neck and A-line skirt do the rest. Jewel-tone florals suit fall and soft pastels suit spring. I'd choose a knee or midi hem; a mini wrap can blow open in a breeze. Cork or espadrille wedges add height and stay stable on grass, and a straw bag and fine layered necklaces make it ready for a baby shower or an outdoor dinner.
3. Wide-Leg Trousers And A Structured Blazer
A matching blazer and wide-leg trouser set is the office outfit I'd buy before any other. Ponte or crepe is the fabric to look for; both stretch enough to sit at a desk all day and still hold a crease. Wear the single-button blazer open over a camisole or fitted tank. Camel, charcoal and navy all mix with the rest of a work wardrobe. The wide leg balances broader shoulders, and pointed heels or loafers keep the hem from swallowing the foot. Add a leather tote and a metal-bracelet watch.
4. Maxi Dress With A Cropped Denim Jacket
A cropped denim jacket that stops at the natural waist gives a printed maxi a defined middle while the skirt keeps moving. Choose a dress with an empire waist or smocked bodice; at 18/20, bust support decides whether a maxi feels comfortable after an hour. Floral, paisley, or abstract patterns in bright colors suit it. I'd wear white sneakers for a sightseeing day and flat sandals for a dinner. A canvas tote and beaded earrings round it off for a market or a picnic. If the jacket won't close, that's fine; it's meant to be worn open.
5. Jumpsuit With Strappy Heeled Sandals
A dark jewel-tone jumpsuit is one of the few one-piece outfits that photographs as dressy. Look for a tie belt or seamed waist, and a wide or straight leg. A surplice bodice gives support and shows a little collarbone. The fitting point I always check is the crotch depth: if it hangs low, the jumpsuit looks sloppy; if it's short, it pulls up all evening. Metallic or nude strappy heels lengthen the leg, and a chain-strap clutch with drop earrings gets you to a birthday dinner or cocktail party.
6. Oversized Sweater And Faux Leather Leggings
An oversized sweater and faux leather leggings is a common weekend pairing, and the part people get wrong is the sweater length. It should cover the seat; side slits or a slightly shorter front keep it from looking like a tent. Leggings with a high, wide waistband stay up without rolling. Chunky lug-sole ankle boots, a long pendant, a slouchy beanie and a crossbody bag finish the look for errands. Faux leather gets warm, so I'd keep this for cool days.
7. A-Line Midi Dress With Low Block Heels
For a wedding guest, I'd go with an A-line midi that falls from the bust or waist and doesn't grip the hip. Chiffon, crepe and light satin all move without adding bulk; heavy satin can show every crease after you've sat through a ceremony. Puff sleeves, a ruffle hem or a lace overlay give it interest. Low block heels handle grass and long receptions. A fascinator or embellished headband adds formality, a structured mini bag holds the basics, and a pashmina covers bare arms if an outdoor venue cools after dark.
8. Linen Shirtdress With Flat Slide Sandals
A linen shirtdress is what I wear in real heat. Linen breathes better than almost anything, but it wrinkles within minutes of sitting, so accept that as part of the look. Choose a relaxed body with a self-tie belt or drawstring so you can set the waist. Roll the sleeves and leave the top buttons open. Tan or white leather slides, a big straw hat, bold sunglasses and a woven market tote make it right for a beach lunch or a garden tour. Check the button spacing at the bust; a gap there is the usual problem with shirtdresses.
9. Tunic Top And Skinny Jeans Outfit
Skinny jeans with a long tunic is an old formula that still works if the tunic is right. Side slits are what make it: they let the hem move and show a little of the jean at the hip, which keeps the outline long. A soft knit or silky fabric drapes; a stiff cotton tunic tents. Dark-wash skinnies with good stretch, pointed ballet flats or heeled mules, a long pendant and stacked bracelets. I'd wear it to a casual office or a lunch.
10. Pencil Skirt And Draped Blouse
Knit pencil skirts are much easier to wear than woven ones at 18/20, since a stretch panel moves when you sit and walk. Keep the hem at the knee. On top, a draped blouse with soft ruching or a cowl neck, with just the front tucked so the waist shows without adding bulk at the back. One color top to bottom, all black or tones of burgundy, makes the outline longer. Modest-heel pumps, a structured satchel and pearl studs carry it into a formal meeting. Check the back vent; a skirt without one limits your stride.
11. Denim Shorts And An Off-The-Shoulder Top
Off-the-shoulder tops show off the shoulders and collarbone, and an elasticized neckline with a ruffle stays up best. Pair one with mid-rise distressed denim shorts with a relaxed leg; tight leg openings pinch and ride up. Inner-thigh chafing is the usual complaint with shorts, so I'd choose a slightly longer inseam or wear thin anti-chafe shorts underneath. Flat espadrilles or strappy sandals, a straw fedora, round sunglasses, thin gold bracelets and a mini backpack make it a boardwalk or outdoor-concert outfit.
12. Sweater Dress With Knee-High Boots
A ribbed midi sweater dress with side slits is the fall and winter dress I lean on most. A mock neck or turtleneck adds warmth. The fit should outline you without squeezing; if the rib stretches open across the hip, go up a size. Knee-high block-heel boots, in a wide-calf width if you need it, should slide under the hem so no leg shows between them. A long wool coat for outside, a leather crossbody and plain gold jewelry. Swap the coat for a denim jacket on a weekend.
13. Palazzo Pants With A Fitted Tank Top
Silky printed palazzo pants have a lot of movement, so the top needs to be close-fitting: a ribbed tank or bodysuit tucked in cleanly. The high waist makes the legs look longer. Metallic flat sandals or heeled mules keep the shoes from interrupting the flow of the fabric. Statement earrings and bangles add some resort feeling, and a woven clutch and a light kimono over the shoulders give cover if the evening cools. I'd try palazzos on in the shoe you'll wear; at this width, a too-long hem catches under the heel.
14. Trench Coat Over Straight-Leg Jeans And A Sweater
A trench coat ties a between-seasons outfit together. Layer it over a light cotton or cashmere sweater and dark straight-leg jeans that end at the ankle bone. At 18/20, I check a trench across the back with the arms forward; many are cut slim through the shoulder blades. Belted, the trench shapes the waist, and the lapels draw the eye up and down. White leather sneakers or loafers, and a silk scarf at the neck or on a bag handle. Errands, travel and a casual client meeting all fit.
15. Peplum Top And Tailored Ankle Pants
A peplum top marks the waist and falls over the hips; tailored ankle pants with a pressed crease keep the lower half sleek. I'd check that the peplum seam lands at your true waist. When it falls a few inches below, the top looks like it's slipping off. Pointed flats or low kitten heels keep the leg line going, and a chain shoulder bag with small studs keeps it neat. Wear it to a networking event or a formal brunch when a suit feels like too much.
16. Kimono And White Jeans Outfit
A printed chiffon kimono is a cheap way to make white jeans and a tank feel finished. Pick the tank in one of the kimono's colors. White jeans in straight or skinny cuts give a clean background for the print. Many shoppers avoid white denim because it shows lines and can be sheer, so I look for a heavier weight and wear nude underwear. Cork sandals or espadrilles, wooden bead earrings, a braided belt and a fringed crossbody suit an art fair or a long lunch.
17. Utility Jumpsuit With Platform Sneakers
A utility jumpsuit in cotton twill or light denim is my pick for busy Saturdays. The zip front, patch pockets and drawstring waist all do work: pockets for a phone, drawstring for shape. Hem it, or roll it, to ankle length so it doesn't pool on the shoes. White platform sneakers, a belt in denim or canvas, a leather backpack and sporty sunglasses. Twill softens with washing, so expect the first wears to feel stiff.
18. Slip Dress With A Cropped Cardigan
A satin midi slip dress goes up or down depending on what you layer on it. For an evening, I'd put a cropped cardigan or structured shrug over it for arm coverage. Look for adjustable straps and a slight bias cut, which skims curves. Bias satin shows bra lines and panty lines, so a smoothing slip or shapewear underneath helps more than any accessory. Strappy heels, a beaded clutch and crystal drop earrings finish it for an anniversary or a gallery opening.
19. Paperbag Shorts And A Linen Button-Down
Paperbag shorts are cut wide through the hip and thigh, with a gathered waist and a tie belt that shows the narrowest point. That combination is why they're easier to wear than fitted shorts. Pair them with a linen button-down, tucked at the front or knotted. Khaki, olive or black mixes with most tops. Flat leather sandals, a woven tote, tortoiseshell sunglasses and a pendant make them right for an outdoor brunch or a city walk. I'd avoid paperbag waists if you have a short torso; the gathers can look bunched.
20. Faux Fur Coat Over A Knit Dress
A faux fur coat turns a plain knit dress into a party outfit. I'd choose one with a shawl collar or open front; a high, wide collar adds bulk at the shoulders. Under it, a knee-length knit dress with a boat, V or mock neck. Opaque tights and pointed heeled booties add warmth and length. A velvet clutch and statement earrings make it a holiday party look. Shake faux fur out after wearing and store it on a wide hanger; folding flattens the pile.
21. Matching Two-Piece Knit Set
A knit set of a relaxed sweater and wide-leg pants feels like loungewear and passes for daywear. Oatmeal, charcoal and dusty rose can also be worn as separates. One color from neck to ankle makes a long vertical line, which is what flatters here. In cold months, a long coat goes on top; in spring, white sneakers alone. A chain necklace and leather tote give the soft knit some structure. I'd check the knit thickness; thin knits cling and show every bump, while a mid-weight knit falls straight.
22. Boyfriend Jeans With A Graphic Tee And Blazer
Boyfriend jeans, a graphic tee and a blazer mix casual and tailored pieces. The jeans should sit at the hip without sliding; a relaxed seat is part of the cut, but a gaping waist isn't. A soft vintage-style tee with a curved hem, and an open blazer on top that sharpens everything. White leather sneakers, a structured bag, hoops and a bold lip. Creative meetings and weekend gallery trips both suit it. If the tee is long, a quick front tuck keeps the jean's waistband visible.
23. Pleated Midi Skirt With A Turtleneck
A pleated midi skirt with a fine-gauge turtleneck is a fall and winter pairing with plenty of texture. Choose knife or accordion pleats stitched down to the high hip so they open below it rather than at the widest point. Tonal colors make the line longer: a burgundy skirt with a blush top, or charcoal with dove gray. Block-heel ankle boots fit under the hem, and a long pendant draws the eye down. A wool fedora is optional. It goes from the office to an after-work drink with no changes.
24. Swimsuit With A Sarong And Sandals
For the beach, start with a supportive one-piece or high-waisted bikini. At 18/20, underwire or a molded cup usually gives more support than a bandeau. Tie a lightweight sarong at the hip or waist so it falls like a skirt, which covers and moves. Flat jeweled sandals, a wide-brim hat, oversized sunglasses and a straw tote carry you to a boardwalk lunch. Quick-dry fabrics let you go from water to a cafe without a full change. Rinse suits in cool water after salt or chlorine to keep the elastic from going slack.
25. Velvet Blazer And Straight-Leg Trousers
When an evening is dressy but not formal, a velvet blazer with straight-leg trousers is what I'd suggest. Deep emerald, navy or plum velvet catches light softly. Wear it open over a silky camisole with lace trim, and choose trousers that skim the leg with a pressed front seam. Velvet crushes under pressure, so hang the blazer right away and steam it instead of ironing it. Metallic pointed heels, a jeweled clutch and chandelier earrings make it fit for a gala or a milestone birthday.
Three Quick Tailoring Jobs That Change Everything
Most of these outfits look better after one small trip to a tailor. These are the jobs I ask for most in this size range, and none of them is expensive or complicated.
Taking in the back waist of jeans and trousers
A pair that fits the hip and thigh often gaps at the back waist. A dart or a small seam at center back closes that gap, and it's the single job that makes most trousers look made for you.
Hemming for the shoe you'll wear
Wide-leg trousers and palazzos should be hemmed with the shoes on. A hem that just grazes the top of the shoe is the most flattering; a pooling hem gets dirty and drags the line down.
Adding a hidden snap to wrap and button tops
A tiny snap between two buttons on a shirt, or at the cross of a wrap dress, stops gaping at the bust. It takes minutes and you can sew one on yourself.
Start With the Pieces That Fit at the Waist
If I had to narrow these 25 outfits down, I'd start with three: well-fitting high-waisted jeans, a wrap dress and a ponte blazer-and-trouser set. Each one depends on a good fit at the waist, and once those three fit, the rest of this list builds on them. Try new pieces on sitting as well as standing, keep tags on until you've moved in them, and give your tailor the small jobs. Wear the outfits that make you feel like yourself, from work meetings to holidays.
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