We Opened a Shop in Oxford! It's Filled with Positive Pants and Sustainable Gifts.

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What size am I?

Details of the styles and sizes available in our men's, women's and girls ranges are given below. If you aren't sure or are in the middle of range, we would suggest you go for the larger size so they are more comfortable.

To measure yourself:
Band: wrap the tape measure around your body, just under your bust.
Waist: measure around your body approximately 5cm below your natural waist where the waistband of trousers normally sit.
Lower hip: wrap the tape measure around the fullest part of your hips and bottom.

If you need more specific sizing help, please email us at help@youunderwear.com.

Two-Way Strap Bralette
Extra Small Small Medium Large
Dual UK Sizes 8-10 10-12 12-14 14-16
To fit your chest band width 27" (68.5 cm) 29.5" (75 cm) 32" (81 cm) 34.5" (87.5 cm)
Fits bra sizes (approx.) 30 B/C/D - 32 A/B/C 32 B/C/D - 34 A/B/C 34 C/D - 36 A/B/C 36 C/D - 38 A/B
Women's Thongs, Bikinis, and Boy Shorts
6 8 10 12 14 16 18 20 22
EU size 34 36 38 40 42 44 46 48 50
Waist size 23-24" 25-26" 27-28" 29-30" 31-32" 33-34" 35-36" 37-38" 39-40"
Hip size 33" 35" 37" 39" 41" 43" 45" 47" 49"
Men's Hipster Trunks
Small Medium Large Extra Large 2 XL
Waist size (measured) 31-33" 33-35" 36-38" 39-41" 41-43"
Equates to clothing size (approx.) 30-32" 32-34" 34-36" 36-38" 38-40"

Girls' bralettes


For our girls' bralettes we named our four size options after Ugandan villages, the country that inspired our original business concept: Jinja, Kira, Lira and Masaka. This is because we feel that there isn’t a set size for bodies at different ages, and we don’t want to put any additional pressure on young girls. We hope that this flexible size description will help to encourage body positivity in girls at the outset of their relationship with bras. We suggest using band width as a starting point, although do get in touch if you have any specific sizing questions.

Girls' Bralettes
Jinja Kira Lira Masaka
Chest band width 23" (57-58 cm) 25" (63-64 cm) 27" (68-69 cm) 29" (73-74 cm)
Fits age (approx.) 9-10 10-11 11-14 13+
As worn by: Hollie & Amelia, age 9 1/2,
band with 23"
Help us fill this in ... Liv, age 11.
Phoebe & Flora, age 11 1/2.
Lana, age 13 1/2, 69cm band width,
wears 30B/XS.
Beth, age 14.
Hannah, 32C

Shipping Rates

UK Orders

Sample Order Postage Cost
Single items & smaller packs £1.90
Larger packs £3.95
All posted using Royal Mail 24 First Class service
Upgrades available at Checkout
Free shipping on UK orders over £60

International Orders

Region Sample order Postage Cost
Europe All orders £9.90
USA & Rest of the World Single items & smaller packs £10.50
Larger packs £19.90
All posted using Royal Mail's International Tracked & Signed service

How will my undies be delivered?

We aim to send out all orders placed before 2pm the same day, as we know you will be excited about receiving your new Y.O.U undies :) You will receive a separate email confirmation when your order has been dispatched, so you will know it's on its way and most deliveries arrive within 1-2 business days.

For standard UK orders, we use Royal Mail 24 First Class service, although it's possible to upgrade your delivery options at checkout for an additional charge. We also offer free delivery for all UK orders over £60.

For international orders, we now only use Royal Mail's International Tracked & Signed service to give you extra security and reassurance.

For all our delivery options, we pass on the actual charges as closely as possible (based on average costs) so we only charge you what the delivery costs us. We want our undies to get to you safely and we try to make all our charges as clear and transparent as possible.

What if I change my mind? Refunds & Returns

We want you to love your new super soft Y.O.U undies and hope that they fit perfectly. However we understand that isn’t always the case, so we offer a happiness guaranteed return policy. If you are unhappy for any reason, we offer a fuss-free exchange or refund on all items within 30 days of purchase, or until the 31st of January for products bought in November and December as Christmas gifts.

This is provided they are unworn, unwashed, undamaged and in their original packaging. We will happily exchange the items for another size, style or colour, or refund you if you are not completely happy with your purchase.

Simply return them to us at the address below, along with your name and order number

Y.O.U underwear, 11 Bodley Place, Oxford, OX2 7TF

Unfortunately as a small business and with our charitable donation model we don't cover the cost of returning the items to us, as we simply can't afford to at this stage. We do pay for the replacements to go out though, so you only pay once as a customer.

We hope this gives you confidence to refresh your underwear drawer and start changing the world one pair of pants at a time.

If you have any further questions though, please don’t hesitate to contact us at help@youunderwear.com.


We believe in minimising the packaging and plastic that we use, so all Y.O.U underwear is packaged in reusable, 100% organic cotton bags. These are perfect for storing your undies while travelling, or for holding jewellery, power cables or other items you need to keep safe. We want you to reuse them and not just throw them away, so you can always use them as a gift for someone who makes a difference if you don't want them yourself!

To keep our undies safe and dry on their way to you, we use biodegradable outer packaging. These are made from 100% recycled material with a biodegradable additive and can be recycled again or composted in most areas (this does depend on your local Council collection facilities).
We are continually looking to improve our packaging options and will be moving to paper or home compostable packaging as soon as our order volumes and logistics allow.

We appreciate that many people care about packaging options and we are working to cut out all our single-use plastic and make our packaging as sustainable as possible. We also offer a £1 discount if you don't want our reusable cotton bags (or already have one), please use the code NOBAG at checkout.

" I made it to the age of 24 without finding the perfect bra. Finally one which looks good, is chic & comfy! A combination hard to find "
- Lydia

Look good, do good, feel good