How to Find Your Underwear Size Without Trying It On

Quick answer

Measure your waist and hips with a soft tape, then compare those numbers to the brand's own underwear sizing chart. If you're between sizes, size up for comfort. Always check the brand's fit notes because a boxer size guide and a briefs size guide can differ even within the same label.

Buying underwear online saves time, but it can feel risky when you can't try anything on. The good news is that you don't need to guess. With a soft measuring tape and a few minutes, you can find your underwear size at home.

This guide walks you through measuring your waist and hips, reading an underwear sizing chart, and using fit tips to choose the right size the first time. We'll also cover what to do when you're between sizes and how different styles like briefs and boxers can affect your choice.

What you'll need before you start

Grab a soft measuring tape, or use a piece of string and a ruler if you don't have one. Wear lightweight clothing or just your current underwear so the tape sits close to your body. Stand in front of a mirror or ask someone to help you read the numbers.

Write down your measurements as you go. You'll need your waist and hip measurements to compare against any underwear sizing chart. Don't pull the tape too tight or let it sag; it should sit snug but flat against your skin.

• Soft measuring tape or string plus a ruler
• Mirror or a helper for accurate reading
• Notepad or phone to record numbers

Step 1: Measure your waist

Wrap the tape around your natural waist, which is the narrowest part of your torso, usually just above your belly button. Keep the tape level all the way around and breathe normally. Don't suck in or hold your breath.

Read the number where the tape meets. This is your waist measurement. If you're measuring for low-rise underwear, you might also measure around your hips where the waistband would sit, but for most size charts, the natural waist is the starting point.

• Common mistake: pulling the tape too tight and getting a smaller number than reality.
• Checkpoint: The tape should stay in place without you holding it, but not dig into your skin.

Step 2: Measure your hips

Stand with your feet together. Wrap the tape around the fullest part of your hips and buttocks, usually about 8 inches below your waist. Keep the tape parallel to the floor.

This measurement is often the most important for underwear fit because it determines how the garment sits around your seat and thighs. Record the number where the tape meets.

• Common mistake: measuring over bulky clothing, which adds inches.
• Checkpoint: The tape should be snug but not compressing your skin.

Step 3: Check the brand's size chart

Every brand has its own size chart, so don't assume you're the same size everywhere. Look for the chart on the product page or the brand's website. Match your waist and hip measurements to the closest size, but always follow the brand's specific guidance.

If the chart lists a range, like 28-30 inches, and your measurement falls at the top of that range, consider sizing up. Underwear that's too tight can dig in and cause discomfort, while slightly looser underwear often feels better for all-day wear.

• Common mistake: using a generic size chart from a different brand.
• Checkpoint: If your waist and hips point to two different sizes, go with the larger size for comfort.

Step 4: Factor in style and fabric

Different styles fit differently. For example, a boxer size guide might suggest a looser fit, while a briefs size guide might be more form-fitting. Fabric also matters: stretchy modal blends can accommodate a range of sizes, while rigid cotton has less give.

If you're buying a style with a pouch option, like some boxers or briefs, the pouch can affect how the underwear sits. Read the product description for fit notes and choose the option that matches your body and preference.

• Common mistake: assuming your size in one style equals your size in another.
• Checkpoint: Check if the product page mentions if the style runs small or large.

Step 5: When you're between sizes

If your measurements fall between two sizes, sizing up is usually the safer choice for underwear. A slightly larger size won't dig in or leave marks, and you can always adjust with the waistband. However, if you prefer a snug fit, you might size down, but be aware of potential discomfort.

Consider the fabric's stretch. Modal blends, for instance, have good stretch and recovery, so they may feel more forgiving. If the brand offers a set or bundle, you can try different sizes without committing to a full pack.

• Common mistake: choosing a size that's too small because you're used to a certain fit in other brands.
• Checkpoint: Read reviews for fit feedback, but remember that fit varies by body type.

Step 6: Use the brand's fit tools and return policy

Many online brands provide fit guides or size calculators. Use them if available. Also, check the return policy before you buy. A generous return policy lets you try your size at home and exchange if needed.

If you're still unsure, start with one or two items rather than a large bundle. Once you confirm your size, you can confidently buy more. Being Wear offers sets and bundles that can save money, but it's smart to verify your size first.

• Common mistake: ignoring the return window and getting stuck with the wrong size.
• Checkpoint: Save your measurements and the brand's size chart for future orders.

Your step-by-step underwear sizing routine

1. Measure your waist: Wrap a soft tape around your natural waist, keep it level, and breathe normally. Record the number. Checkpoint: The tape should be snug but not tight enough to leave marks.
2. Measure your hips: Measure around the fullest part of your hips and buttocks, keeping the tape parallel to the floor. Checkpoint: If your hip measurement is much larger than your waist, prioritize hip size for bottoms.
3. Compare to the brand's size chart: Use the specific chart for the brand you're buying from. Match your measurements to the closest size. Checkpoint: If you're between sizes, size up for comfort.
4. Check style and fabric notes: Read the product description for fit details. Modal blends stretch more than rigid cotton. Checkpoint: A boxer size guide may differ from a briefs size guide, even in the same brand.
5. Start with one or two items: Before buying a bundle, order a single pair or a small set to confirm your size. Checkpoint: Verify the return policy so you can exchange if needed.

How Being Wear sizes work in practice

• boxer: Crafted from signature modal fabric with a deep 40mm waistband, internal flatlock seams, and tag-free design; available with or without pouch. The 40mm waistband sits securely without rolling, and the modal fabric stretches for a forgiving fit. If you're between sizes, the stretch may help, but the waistband still needs to match your waist measurement.
• brief: Made from ultra-soft modal with a smooth 30mm waistband, external cover seams, internal flatlock seams, and tag-free design; available with or without pouch. The 30mm waistband is narrower than the boxer's, so it may feel different on your waist. Use your hip measurement to ensure the briefs don't ride up.
• bralette: Made from signature modal fabric with a flexible, form-hugging fit, light support, and tag-free, seam-smooth design. The flexible fit means the bralette adapts to your shape, but you still need your underbust measurement to choose the right size. If you're between sizes, the stretch may accommodate you.

Finding your underwear size without trying it on comes down to accurate measurements and using the brand's own size chart. Measure your waist and hips, check the fit notes for the style you're buying, and when in doubt, size up. With these steps, you can order online with confidence and enjoy comfortable underwear from day one.