Women's bodies do not stop at size L, and neither should underwear sizing. ONYX offers sizes up to 5XL to make sure more women can find pieces that feel comfortable, supportive and beautiful.

This is not about following a trend. It is about making everyday essentials that respect real shapes, curves and proportions instead of forcing everyone into the same narrow size range.

Why Inclusive Sizing Matters

For many women, shopping for underwear used to mean squeezing into the closest size available or leaving empty-handed. Inclusive sizing changes that experience by offering pieces designed with different bodies in mind, not just scaled-up versions of one sample size.

• More sizes mean more women can find underwear that actually fits
• Better fit reduces digging waistbands, rolling edges and discomfort
• Seeing your size listed sends a clear message: you belong here

When your underwear fits properly, you think about it less and feel more at ease in your clothes and in your own skin.

Why ONYX Goes Up to 5XL

Extending sizes up to 5XL allows ONYX to serve women who are often ignored by standard size ranges. Instead of stopping at XL or 2XL, the size run is built to cover more waist and hip measurements with thoughtful grading.

• Waistbands designed to sit comfortably without cutting in
• More fabric where it is needed for coverage and support
• Patterns adjusted for curves, not just stretched from smaller sizes

The goal is simple: underwear that works for everyday life, whether you are lounging at home, working long shifts or getting ready for a special night out.

How to Find Your Perfect Size

Sizing starts with measurements, not guesswork. Grab a soft measuring tape and use the ONYX size chart before you add to cart.

• Measure your natural waist where your body bends when you lean to the side
• Measure the fullest part of your hips and bottom
• Compare both numbers with the size chart to choose the closest match

If you are between two sizes, consider how you like your underwear to feel. Choose the smaller size for a snug hold, or the larger size for a softer, more relaxed fit.

Common Sizing Mistakes to Avoid

Many women wear the wrong size for years simply because they are used to how it feels. A few small changes can make a big difference in comfort.

• Choosing by letter (M, L, XL) instead of checking the measurement range
• Ignoring how the waistband and leg openings sit after a few hours of wear
• Sticking to one size even as your body changes over time

Try on new styles at home and move around—sit, walk and stretch—to see how they behave in real life, not just in front of the mirror.

Every Size Deserves Beautiful Underwear

Offering sizes up to 5XL is about more than numbers on a label. It is about letting more women enjoy the same fabrics, colors and designs instead of limiting style to a small size range.

• Matching sets that look good and feel good in every size
• Colors and cuts designed for curves, not to hide them
• Underwear that supports body confidence instead of shame

You deserve underwear that fits the body you have today—not the one you were told to have. Start with your true measurements, choose your ONYX size and feel the difference that inclusive design can make.

ONYX Underwear — inclusive sizing from XS to 5XL, created to celebrate every curve, every day.