In reply to FrankBooth:
This sort of thing has been going on with women's clothing sizing for years - though at least with a lot of men's clothing, sizing seems to be based more on logic rather than arbitrary numbers (8, 10, 12, etc).
I did have a disconcerting moment recently with a T-shirt from a new brand calling themselves Ascendancy Apparel. I'm a size 14 (not particularly tubby but tall with broad shoulders etc), which in most brands equates to a women's Large, but they'd decided that a Large was size 10 so now I'm sporting my XXL T-shirt that fits me like a size L fitted T-shirt normally would. I make a lot of clothes, where it's obviously easier to make things that actually fit, but again, discrepancies between pattern brands (and countries) mean that if you're hung up on being a 'Medium' or a 'size 12', it could all be a bit troubling.