tomboyx | Premium Underwear for All Day Comfort. Fit for You.

The Ultimate TomboyX Underwear Size Guide: Find Your Perfect Fit

The Ultimate TomboyX Underwear Size Guide: Find Your Perfect Fit

By tomboyx | Premium Underwear for All Day Comfort. Fit for You. | Published: 2026-08-17

Category: Buying Guides

Learn how to measure yourself, decode the TomboyX size chart, and choose the right fit for your body—whether you're plus size, petite, or in between.

Finding the perfect underwear size can be a game-changer for comfort and confidence. TomboyX offers a wide range of styles from boxer briefs to bralettes, but getting the right fit starts with understanding their sizing system. This guide will walk you through measuring yourself, deciphering the size chart, and choosing the best fit for your body type—whether you're shopping for yourself or a gift.

TomboyX is known for its inclusive sizing and comfortable fabrics, but even the best underwear won't feel great if it's the wrong size. In this guide, we'll cover everything from waist and hip measurements to style-specific fit considerations, so you can order with confidence and enjoy all-day comfort.

How to Measure Yourself for TomboyX Underwear

Before you dive into the size chart, you need accurate measurements. Grab a soft measuring tape and wear little to no clothing for the most precise numbers. Stand naturally with your feet together and measure around the widest part of your hips and the narrowest part of your waist. These two measurements are the key to finding your TomboyX size.

For most underwear styles, TomboyX uses hip measurements to determine size, but waist can be important for high-waisted or mid-rise styles. Write down both numbers and compare them to the size chart. If you fall between sizes, consider the style and your personal preference—do you like a snug fit or a bit of room?

  • Use a soft, flexible measuring tape for accuracy.
  • Measure your waist at the natural waistline (usually near the belly button).
  • Measure your hips at the fullest part, typically 7-9 inches below your waist.
  • If you're between sizes, size up for a relaxed fit and size down for a snug fit.

Decoding the TomboyX Size Chart

TomboyX offers sizes from XS to 4X, and their size chart is designed to be inclusive. For most bottoms, the key measurement is hip circumference. For example, a size M typically fits hips of 38-40 inches, while a size 2X fits hips of 50-52 inches. Always check the specific product page, as some styles may have different fits.

It's also important to note that TomboyX uses numeric sizing for some items, like their 4.5" Trunks 3-Pack - Fern and Floral, which may be labeled by waist size. If you're unsure, reach out to their customer service—they're known for being helpful and responsive.

  • Always refer to the size chart on the product page for the most accurate fit.
  • For multipacks, the size is consistent across all items in the pack.
  • If you're between sizes, read reviews from customers with similar measurements.

Style-Specific Fit Tips: Boxer Briefs, Briefs, and More

Different styles have different fits, even within the same size. Boxer briefs, like the 6" No Fly Boxer Briefs 3-Pack - Stripe Up, offer full coverage and a snug fit through the thighs. If you're between sizes, you may want to size up for a more relaxed leg opening, especially if you have muscular thighs.

Briefs and bikinis, such as the Bikini - TENCEL Modal Ink Blue Edge, have a more minimal cut and rely on hip measurements. These styles tend to run true to size, but if you prefer a cheekier look, you might size down. For period underwear, like the First Line Period Bikini 3-Pack - Future Dusk, fit is crucial for leak protection, so follow the size chart closely and consider sizing up if you're close to the upper limit.

  • Boxer briefs: size up for a looser fit in the legs.
  • Bikinis and briefs: true to size, but size down for a cheekier look.
  • Period underwear: consider sizing up for extra coverage and confidence.

Finding Your Fit for Plus Size and Petite Bodies

TomboyX is celebrated for its extended sizing, and plus-size customers often find that their size runs true to the chart. However, if you're plus size and carry weight in your belly, you might prefer high-waisted styles that offer more coverage and support. For those on the petite side, the main issue is often length—boxer briefs might be longer than you'd like. In that case, consider the 4.5" Trunks 3-Pack - Fern and Floral, which offers a shorter inseam.

Petite shoppers should also pay attention to the rise of the underwear. A mid-rise might hit at an awkward point, so look for low-rise or high-rise styles that flatter your frame. Reading reviews from customers with similar body types can be incredibly helpful.

  • Plus size: opt for high-waisted styles for extra tummy control.
  • Petite: choose shorter inseams like trunks to avoid excess fabric.
  • Read reviews from customers with similar body types for real-world fit insights.

How to Adjust Your Size for Different Fabrics

TomboyX uses a variety of fabrics, from soft cotton to stretchy TENCEL modal. The fabric can affect the fit—cotton tends to have less stretch, while modal and spandex blends offer more give. For example, the Bikini - TENCELTM Modal has a silky, stretchy feel that conforms to your body, so you might stick to your true size. On the other hand, a thicker fabric like the one used in the Packing Iconic Brief - X= Black might have less stretch, so you may want to size up if you're between sizes.

Always check the fabric composition on the product page. If a style has a high percentage of spandex, it will likely be more forgiving. If it's mostly cotton, it may shrink slightly after washing, so consider sizing up if you're on the fence.

  • Stretchy fabrics like modal and spandex are more forgiving.
  • Cotton styles may shrink, so size up if you're between sizes.
  • Check the fabric composition before ordering.

Finding the right TomboyX underwear size doesn't have to be a guessing game. By taking accurate measurements, understanding the size chart, and considering the style and fabric, you'll be well on your way to a perfect fit. Remember, TomboyX's inclusive sizing means there's a great option for every body type. If you're ready to start shopping, check out the 6" No Fly Boxer Briefs 3-Pack - Stripe Up for a versatile, comfortable choice that fits true to size.

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