Size Guide

Before you begin

Use a flexible cloth measuring tape. Measure over light, close-fitting clothing or underwear, stand naturally, and keep the tape flat against your body. It should be snug, not tight.

01 / TOPS

How to measure for a bra

For a bra, take two measurements: your underbust for the band and your full bust for the cup area.

Underbust (band)
Place the tape directly underneath your bust, around your ribcage. Keep it level all the way around and comfortably firm. Breathe normally and record the measurement in inches. For the UK-style estimate below, the band is rounded to the nearest even number (for example, 31.5" rounds to 32 and 33" to 34).
Full bust
Measure around the fullest part of your bust, keeping the tape straight across your back. The tape should rest lightly without compressing your bust. This full-bust measurement is compared with the estimated band size to calculate the cup letter.

PERSONAL FIT ESTIMATE

Find Your Bra Size

Enter your measurements in inches to get an estimated UK-style starting size.

The calculator rounds your underbust to the nearest even band size, then subtracts that number from your full-bust measurement. As a guide, a 1-inch difference is A, 2 is B, 3 is C, 4 is D, 5 is DD and 6 is E.

The calculator gives an estimated UK-style starting size, not a guaranteed fit. Bra sizing varies by brand, cut and fabric; check the sizes offered on the product page. Stretch and wireless styles may fit differently from structured bras.

Bra fitting illustration showing where to measure around the underbust — Underbust / band

Bra fitting illustration showing where to measure around the fullest part of the bust — Full bust

02 / BOTTOMS

How to measure for panties

For panties, your natural waist and fullest hip measurements help you choose a comfortable fit.

Natural waist
Measure around the narrowest part of your waist, usually above your belly button. Keep the tape level and do not pull it in tightly.
Full hips
Stand with your feet together and measure around the fullest part of your hips and seat. Check that the tape is level all the way around.

Use your waist and hip measurements with the size details provided for the specific panty style. Different rises, cuts and stretch fabrics can fit differently.

Illustrated guide showing how to measure the natural waist and fullest part of the hips for panties — Waist and full hip

03 / ONE-PIECE

How to measure for a bodysuit

A bodysuit needs to fit comfortably from top to bottom. Measure your bust, waist and hips, and check torso length when the product size guide asks for it.

Full bust
Measure around the fullest part of your bust, keeping the tape level and relaxed.
Natural waist
Measure around the narrowest part of your torso. Keep your stomach relaxed and the tape comfortably snug.
Full hips
Measure around the widest part of your hips and seat, with your feet together.
Torso length (when required)
Starting at the top of one shoulder, run the tape down the front, through the crotch and up the back to the starting point. Keep the tape close to your body without pulling it tight.

Torso length is especially helpful for one-piece styles. Always check whether the individual product provides a torso or body-length measurement.

Bodysuit measurement diagram showing bust, waist, hip and garment length — Bust, waist, hips and length

Still unsure about your size?

Measurements are a guide, and fit can vary with fabric, stretch and design. Check the size details on the product page or contact us before ordering if you are between sizes.

Get sizing help

Bra measurement method: Triumph UK fitting guide. Other measurement illustrations: MyAdira and Impressions.