How to Choose the Right Size in Shapewear

Quick answer

To choose the right shapewear size, measure your waist and hips and compare them to the brand's size chart. When between sizes, size up for comfort, especially for all-day wear, and avoid sizing down for a 'tight' feel as it can cause discomfort and visible lines.

Finding the right size in shapewear is the difference between a smooth silhouette and a miserable day. Unlike regular clothing, shapewear is meant to compress, so the fit rules are different. You might be tempted to size down for extra smoothing, but that often backfires. Instead, focus on how the garment feels and whether it stays in place without rolling or digging in.

This guide walks you through measuring yourself, reading size charts, and knowing when to size up. We'll also share specific products from Heist Studios, like the Sculpt Perforated Outer Bodysuit and The Invisible Brazilian Brief, to help you understand what to look for in different types of shapewear.

Start with Your Measurements

Before you even look at a size chart, grab a soft measuring tape. Measure your natural waist at the narrowest point and your hips at the widest part, usually around the fullest part of your bottom. Write these numbers down. Your bra size matters too if you're buying a bodysuit that covers the bust, like the Sculpt Perforated Outer Bodysuit.

Every brand uses its own size chart, so your usual dress size is not a reliable guide. For example, Heist Studios' shaping pieces may run differently from your everyday underwear. Always compare your measurements to the specific product's chart, not a generic one.

• Measure in your underwear, not over clothes.
• Keep the tape snug but not tight.
• Write down your waist, hips, and bust measurements.

Understand How Shapewear Should Fit

Shapewear should feel snug and supportive, but not painful. You should be able to breathe deeply, sit comfortably, and move without the garment rolling down or riding up. If you have to suck in to fasten it, it's too small.

A good rule: you should forget you're wearing it after a few minutes. If you're constantly adjusting or counting down until you can take it off, that's a sign the size is wrong. For all-day wear, especially under work clothes, prioritize comfort over maximum compression.

• You should be able to take a full breath without restriction.
• The garment should stay in place without constant pulling.
• No bulging or pinching at the edges.

When to Size Up in Shapewear

Sizing up is the right move if you're between sizes, plan to wear the piece for long hours, or prefer a lighter compression. It's also wise if you're buying a shaping bodysuit that covers your bust, because you need room for your chest to move naturally.

Sizing up doesn't mean losing all smoothing benefits. Modern shapewear, like Heist Studios' pieces, are designed with targeted panels that sculpt without needing to be skin-tight. For example, The Invisible Brazilian Brief offers medium compression with a silicone waistband to prevent rolling—even if you choose a size up for comfort, it still smooths effectively.

• Between sizes? Go up.
• Long wear or travel? Go up.
• Sensitive stomach or skin? Go up.

When to Consider Sizing Down (and Why It's Risky)

Some people size down for a 'firmer' feel or extra cinching. But this often leads to discomfort, visible lines, and even digestive issues if worn for hours. Sizing down is rarely the answer unless you're between sizes and the smaller size feels comfortable, not just tight.

If you want stronger shaping, look for a product with higher compression ratings rather than a smaller size. For instance, the Sculpt Perforated Outer Bodysuit is designed with HeroPanels for high-performance compression—so you can get a sculpted look without sizing down.

• Don't size down to fix a fit issue—choose a different product.
• Check the product's compression level before deciding.
• If it leaves red marks after a short try-on, it's too small.

Decision Rules for Choosing Shapewear Size

• Measure first: Always take your waist, hip, and bust measurements and compare to the brand's size chart. Don't rely on your usual clothing size. Your measurements are the starting point.
• Check the compression level: Light, medium, or high compression changes how the garment fits. High-compression pieces like the Sculpt Bodysuit may feel tighter, so consider sizing up for comfort. Match compression to your comfort needs.
• Consider how long you'll wear it: For all-day wear, choose a size that allows comfortable movement and breathing. If you're between sizes, opt for the larger size. Comfort for long wear is key.
• Test the fit: Try it on and move around. If it rolls, digs, or leaves marks, it's too small. If it sags or twists, it's too big. The right fit feels secure and invisible.

Shapewear Options to Consider

• Sculpt Perforated Outer Bodysuit Black: Designed to contour the waist, stomach and bust, this sculpting perforated bodysuit has expertly positioned HeroPanels which offer high performance compression. This is a high-compression piece, so you may need to size up if you're between sizes or prefer lighter shaping. It's ideal for special occasions or shorter wear.
• The Invisible Brazilian Brief: Made from smoothing microfibre and designed with a flattering Brazilian cut, this double-layered shaping brief offers gentle compression and a silicone non-slip waistband to prevent rolling. With medium compression, this brief is forgiving on sizing and works well for everyday wear. The silicone waistband helps it stay put, but if you have a sensitive waist, consider sizing up for extra comfort.

Is It the Right Fit?

Best for

• Those who want a smooth silhouette under fitted clothing without sacrificing comfort.
• People who prefer medium compression for all-day wear.

Not for

• Anyone who wants extreme waist cinching—consider a dedicated waist cincher instead.
• If you have a long torso, a standard bodysuit may not fit; look for tall options or separates.

Choosing the right shapewear size is about balancing smoothing with comfort. Measure carefully, consult the brand's chart, and don't be afraid to size up for longer wear. A well-fitting piece should make you feel supported, not restricted. For everyday shaping, consider The Invisible Brazilian Brief; for a more sculpted look, the Sculpt Perforated Outer Bodysuit is a strong choice—just make sure to check the fit.