Size zero prom dresses

I need advice on where I can buy a UK size 2 or 4 prom dress (US 0 or 00). I've tried on so so many dresses in UK size 6 and even size 4 and they are just fall off me.

I know this sounds like a great problem to have but its really not. It's driving me to tears. Clothes shopping is always difficult for me and I usually make do with baggy clothes but I want to look nice for prom.

What shops have a GOOD SELECTION of size zero dresses?

What if you bought a nice dress and had it adjusted by a tailor?

It's just that that would be expensive and if I could find a nice dress which fits right to start off with, it would be so much easier.

Well the only other thing I could say is shop online...? I really don't know.
At least see how much a dress alteration would cost.

I've seen UK size 2 dresses on Asos. Otherwise you could try getting a dress from a less expensive store like Forever 21 or H&M and then getting it altered so it's not as expensive.

I checked PromGirl and they have US sizes 00 and 0.

You have a reason not to participate in this US tradition that should stay there and not come to this country.

PromGirl does refunds but just not for final sale items