So... she needs a cossie to wear under her wetsuit tomorrow and has grown out of last years, I got one from sainsbos which I thought would fit (based on it fitting me, we're same height and similar weight - ~60kg so she's not slim, quite a muscular build) but it's too long in the body. She's 5'1" but evidently even shorter bodied than me. But she's a 34 DD (actually I think a bit bigger now) - the obvious solution of tankinis all the ones I've seen seem to have quite small cups (or be decidedly mummyish).
I can get to M&S, Next, sports direct or New Look on the retail park.
If anyone happens to have come across a swimsuit that meets these criteria (and which a teen won't go
at) I'd be most grateful!