First bra size guide and size chart for teens 

Finding your size can seem tricky, however here is our helpful guide to finding your first teysha fit. 

Measuring for your organic cotton bras and undies

Remember to wear a soft cup bra or singlet only when measuring your bust size without any padding or bulky fabric.  This will help you get the best measurements.

Grab a measuring tape or if you don’t have one, a piece of ribbon or string that you can measure later with a ruler.

Our size guide represents body measurements. Find the teysha size that is closest to your body measurements on the chart. You may want to size up or down depending what is comfortable for your body.

when should i buy my first bra?

There is no rule to when you should start wearing a bra. At teysha we decided to start our range from the age of around 8 years old. Our training bra, crop top made from the teysha organic stretch fabric, is designed for our girls who may be early developers or those who just want to wear something that covers their chest instead of a singlet.

Which is my type of bra?

First pick something you love the look of. If you wear what you love, the colour and style will give you confidence and make you feel amazing. Crop tops, triangle bras, lace bra’s, strapless what ever works and make sure its in a colour, shape and style your comfortable in. Our designs are fun and stylish, pretty and most importantly made to feel super comfy.

Just remember your bra should feel snug but comfy, no digging no gaping. If in between sizes, size up for growing room.
teysha Size (AUS) Approx. Age Adult AUS Equivalent (Bra) Adult AUS Equivalent (Brief) Waist (cm) Hip (cm) Bust (cm) Under Bust (cm)
88 yrsN/AN/A60-6372-7668-7357-62
10/1210-12 yrs8A-10AN/A64-6777-8174-7962-67
12/1412-14 yrs10A-12AWomen's XS68-7282-8680-8567-72
1515 yrs10C-14AWomen's S72-7586-9085-8972-77
1616+ yrs10D-14BWomen's S-M75-7890-9490-9578-85

Ages are a general guide only — every body develops differently, so always check the cm measurements above for the best fit.

Fit Tips

  1. Band should sit snug and level, not riding up at the back.
  2. No gaping or digging in at the cups or underbust.
  3. If you're between two sizes, size up for extra growing room.
  4. Straps should sit flat without slipping or digging into shoulders.
  5. Re-measure every few months — bodies change fast during these years!

Size Guide FAQs

What size bra should a 12 year old wear?

There’s no single bra size for a specific age — it depends on your body measurements, not how old you are. Use the size chart above to match your bust, under bust, waist and hip measurements to the closest teysha size. Every body develops differently, so measuring is always the most accurate approach.

How do I know my bra size without measuring?

If you don’t have a measuring tape handy, use a piece of ribbon or string and measure it against a ruler afterwards. You can also try a couple of sizes and choose whichever feels snug but comfortable, with no digging or gaping.

Is teysha true to size?

teysha bras and underwear are designed to fit true to size based on body measurements. If you’re in between sizes, we recommend sizing up for extra growing room.

Does the teysha size guide work for New Zealand customers too?

Yes. Our size guide is based on standard body measurements in centimetres, so it applies the same way whether you’re shopping from Australia or New Zealand.

Press play to help decide 
which underwear to buy