QUOTE(Czerny @ May 27 2009, 08:48 PM)

Do Gap and Banana Republic use American sizing? I wear a size 0 from both those shops and am less tiny than I used to be.
There's always the chance their size 0 (UK 4) is the equivalent of another shops size 2 (UK 6) - see below about difference in fit. A UK size 0 would be a US -4 and for that you'd need to have the build of a child around about aged 7, so I would say the sizes your quoting are the American system and the clothing itself perhaps a little more generous in cut. I've never shopped at either place because of cost and GAP is a bit, well errr, common

(ie. every Tom, #### and Harry wears it) but I might just go and try some clothing on for size. Does the size 0 stuff you wear contain lycra, or have a general 'give' in it?
QUOTE
M&S and Next have definitely both increased the dimensions of their respective sizes (waist measurements, at least) considerably.
No two clothing companies use the same models on which to base their clothing sizes. They all have sample people who willingly have their body measured and clothing sizes based on an average of those sample measurements. This is the reason there is so much variety in fit and what one shop calls a size 10 for example, will be what another calls a size 8.
Generally speaking I find Italian made clothing fits me best, because the Italians (on average) tend not to be as tall as people from a lot of the other European countries. For my favourite label, when I can afford it, I'll buy D&G.