big boobs, can't wear anything when I do sports

Does the UK size bras differently than the US? I'm 5'2" as well and a 34C and my boobs are about medium sized, closer to small. In fact, my sports bras are a size small. When working out, I just put on a sports bra, which compresses them and makes them look almost non-existent. Then I'll just wear a random tank top or t-shirt over that.

Edited by: CHLOEAGH at: 11/20/2012 (18:41)

I have huge boobs for my sie I am 5'2 and I am 53 kg my cup size is 36C I don't know which clothes to wear in winter when I play sports like lacrosse.. I feel so shy and I wear stupid sweaters to cover them. It may sound funny but it is a torture. I don't want to look funny specially in cold weather (if you know what I am saying! lol)
What should I wear, can you recommend Bras, Base layers or tshirts.
my God I am so miserable
I am in the UK
I usually buy Adidas stuff but I don't mind other brands at all...
if you have the same problem can you tell me what you're wearing?
Thx