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When I used to work there (early '00s but I can't see that much has changed) we used to tell people that the American size was two sizes below, and then to go down a size from that, so a UK size 10 was technically a Gap US 6, but try a 4 if you're used to Topshop etc. Sometimes even more. I used to wear a Gap 4 even as a 12 in British shops.
Really put the Daily Mail "size 0" debate into perspective, since a Gap size 0 is basically a modern UK size 6 (i.e. would have been an 8 in the 60-70s).