5 Plus-Sized Shapewear Pieces for Dresses
Written by Karen RobbinsFinding the perfect dress is one thing. Finding one that looks and feels great? That’s a little trickier—especially when the foundation underneath isn’t fitting right. That’s where shapewear comes in. The right piece doesn’t squeeze or restrict—it supports, smooths, and helps your clothes fit the way they’re meant to.
If you’ve ever avoided shapewear because you thought it meant stiff fabrics or impossible-to-breathe compression, consider this your sign to give it another look. SPANX plus-sized shapewear is built for real movement, all-day comfort, and real women—available in sizes up to 3X.
Here are five of our favorite plus-sized shapewear pieces for dresses—each one engineered to help you feel smooth, supported, and unstoppable.
SPANXshape Invisible Mid-Thigh Bodysuit
Invisible by name and by nature, the SPANXshape Invisible Mid-Thigh Bodysuit is a one-and-done solution for smoothing from every angle. With medium compression, this bodysuit gently hugs your core, waist, and thighs—creating a sleek foundation that disappears under clothing. The seamless, laser-cut edges mean no lines, no rolling, and no show-through (even under silk or satin).
Breathable, flexible, and designed for comfort, it moves with you instead of against you—so you can dance, sit, and celebrate without a second thought.
Wear it with:
- A fitted wrap dress that highlights your waist.
- A satin midi dress for holiday parties or weddings.
SPANXsculpt OnCore Open-Bust Brief Bodysuit
When you want sculpting power that stays comfortable, the SPANXsculpt™ OnCore Open-Bust Brief Bodysuit delivers. It features targeted compression zones that firm and smooth your tummy, sides, and back—all while offering a natural-looking shape through your bust and booty. The open-bust design lets you pair it with your favorite bra, while the bonded tummy panel provides extra shaping where you want it most.
It’s powerful yet flexible, sculpting your silhouette while staying completely invisible under even the most fitted styles.
Wear it with:
- A structured sheath dress for a clean, contoured look.
- A sleek pencil dress that needs extra smoothing through the midsection.
SPANXsupersculpt TotalContour Open-Bust Mid-Thigh Bodysuit
If you’re looking for ultra-powerful compression, this is the one. The SPANXsupersculpt™ TotalContour Open-Bust Mid-Thigh Bodysuit transforms your curves with targeted shaping from bust to thigh. It’s engineered with LYCRA® FitSense® print technology and flexible built-in boning for 360° sculpting and serious waist definition.
The adjustable straps keep everything comfortably in place (no rolling here), while the open-bust design means you can still wear your own bra. Back seam shirring gives your booty a natural lift, and the quick-drying, breathable fabric keeps you cool even under thicker dress fabrics.
Wear it with:
- A sequin bodycon dress that deserves a smooth, sculpted finish.
- A fitted velvet gown for events when you want a snatched silhouette.
SPANXshape Invisible Tank Brief Bodysuit
For lightweight smoothing with everyday versatility, the SPANXshape Invisible Tank Brief Bodysuit is a wardrobe essential. It features medium compression through the core with a flexible tank-style top that moves naturally with your body. The seamless edges and smoothing fabric make it ideal for layering under dresses where you want coverage and control without bulk.
It’s the perfect blend of shaping and comfort—giving you that “held-in” feel without ever feeling restricted.
Wear it with:
- A flowy A-line or fit-and-flare dress for subtle shaping and support.
- A knit or ribbed midi dress for a smooth, invisible finish.
SPANXsculpt Seamless Power Thong Bodysuit
Sleek, sculpting, and totally seamless—the SPANXsculpt™ Seamless Power Thong Bodysuit gives you powerful compression through the waist and core while keeping panty lines completely invisible. Made with 4-way stretch fabric, it provides serious shaping power with an ultra-smooth feel.
The thong back makes it perfect for fitted or body-hugging styles, while the open-bust neckline lets you wear your favorite bra. It’s designed for confident nights out—when you want shaping that supports without showing.
Wear it with:
- A fitted knit dress for a streamlined, sculpted finish.
- A tailored blazer dress or suiting-inspired style that needs no lines, no seams, no fuss.
Best Plus-Sized Shapewear
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FAQ about Shapewear for Dresses
What size should I order in SPANX shapewear?
We recommend ordering your typical dress size. SPANX shapewear is designed to fit true to size with our SPANXeffect compression technology that adapts to your body. If you're between sizes or prefer lighter compression, size up. All our plus-size shapewear is available up to 3X, and we provide detailed size charts on each product page to help you find your perfect fit.
What's the difference between light, medium, and firm compression?
Light compression offers gentle smoothing for everyday wear—perfect if you're new to shapewear. Medium compression provides noticeable shaping and support while staying breathable and flexible for all-day comfort. Firm compression delivers maximum sculpting power with targeted control zones for special occasions when you want a dramatically smooth silhouette. Start with medium if you're unsure—it's our most versatile option.
How do I know which shapewear style is right for my dress?
Match your shapewear to your dress neckline and length. For low-cut or strapless dresses, choose open-bust styles so you can wear your own bra. For midi or maxi dresses, mid-thigh styles prevent ride-up. Bodycon or fitted dresses pair best with seamless, thong-back options to eliminate visible lines. When in doubt, bodysuits offer the most versatility across dress styles.
Can I wear shapewear all day comfortably?
Absolutely! SPANX shapewear is engineered with breathable, moisture-wicking fabrics and flexible compression that moves with your body. Our designs include features like cotton gussets, ventilated panels, and four-way stretch to ensure comfort from morning to night. Many customers wear their SPANX daily and forget they even have it on.
How do I put on and take off shapewear easily?
Start from the bottom: step into your shapewear and gradually pull it up, smoothing as you go. Don't rush—take your time to adjust the fabric evenly over your body. For removal, simply roll it down slowly. Pro tip: putting it on after your makeup and hair are done, but before your dress, makes the process easier and protects your outfit.
What if the shapewear doesn't fit? Can I exchange it?
Yes! We offer returns and exchanges on shapewear purchases. We want you to feel confident in your fit, so if something isn't quite right, we're here to help you find the perfect size or style. Check our return policy for specific timeframes and conditions.
How do I care for my SPANX shapewear?
Hand wash or machine wash on delicate cycle in cold water with mild detergent. Always air dry—never put shapewear in the dryer, as heat can damage the compression fibers and elastic. Proper care extends the life of your shapewear and maintains its shaping power wash after wash.
Will shapewear show through my dress?
Not with SPANX! Our seamless, laser-cut edges and bonded finishes are specifically designed to stay invisible under clothing—even clingy fabrics like silk, satin, and jersey. Choose nude or black shades that match your skin tone or dress color for complete invisibility. Our "Invisible" collection is especially ideal for thin or light-colored fabrics.
Can I wear shapewear with a backless or strapless dress?
Yes! Our open-bust bodysuits work beautifully under strapless dresses when paired with a strapless bra. For backless styles, consider our brief-style shapers or mid-thigh shorts that provide tummy and thigh smoothing without back coverage. Check each product's neckline and back design to ensure it works with your dress cut.
What's an "open-bust" design and why would I want it?
An open-bust bodysuit shapes your torso, waist, and lower body while leaving the bust area open so you can wear your own bra. This gives you the flexibility to choose the bra style, support level, and fit that works best for your dress—whether that's a strapless, plunge, or your favorite everyday bra. It also ensures your bust looks natural while still getting smoothing and support everywhere else.
Why SPANX Makes the Best Plus-Size Shapewear for Dresses
The best shapewear doesn’t just make your clothes fit better—it makes you feel better in them. SPANX designs every piece with real bodies and real comfort in mind, from thoughtful compression zones that smooth where you want it to seamless finishes that stay invisible under any dress.
With sizing up to 3X and flexible, breathable fabrics that move with you, SPANX shapewear lets you step into every outfit—and every occasion—with confidence. Because shapewear shouldn’t change your body. It should celebrate it.