Have you tried at https://radswim.com/collections/rad-swim-tween-swimsuits-bloxd io-collection? I usually buy here.

Thanks so much for these. So far we have bought one from H&M and another one from Zara but unfortunately that didn't fit so it had to go back. Will keep searching the other suggestions. Thanks so much we are both very grateful.

I had the same issue with my daughter, Zara had some nice swimsuits and then we went to Decathlon and found a few bikinis which surprisingly she liked.
We mixed and matched a few and she has been wearing them all summer. Some were more sporty and some a little bit more grown up without being too revealing.
Good luck!

A bit pricey https://samanthasage.com/

Zara has swimwear too! Not loads but enough in high season and good price points for teens. The one at Battersea Power Station is worth a visit, less chaotic than other branches.

I suggest Funkita. Sporty and fun swimwear. Well made. Buy on their website or various swimwear sites.

Next !

H&M or ASOS

Hi I have teen girls who need swimwear for our summer holiday, I've obviously left it a little late but wondering where you go once they grow out of Boden? I have looked on John Lewis but that seems either too high end or a bit dull. Would love to be pointed in the right direction. Thanks so much!