Best Answer: US dress size 0 - UK dress size 4 US dress size 2 - UK dress size 6 and so on...Hope this helps ;) NB. I don't know whether you know but in the UK you only go up in 2's so it's impossible to say which UK size US size 1 would be.est Answer: US dress size 0 - UK dress size 4 US dress size 2 - UK dress size 6 and so on... Hope this helps ;) NB.