Changing room chaos: does your dress size change in every shop?

I'm a different clothes size in every shop I go into.   And I'm often different sizes in the same shop.  This really reminds me of the post I wrote about bra sizing a little while ago - there's no consistency.

I know brands cheat and make Irish and UK sizes bigger than they should be too, so when I go abroad I'm usually horrified to find myself a size up from what I think I should be.  GAH!

And god knows there's NOTHING WORSE than being forced to buy a bigger size than usual

 In Oasis it's pretty constant and I can buy online - I also know my size in French Connection which means I buy tons of clothes in those stores.  Pennys sizes  are crazy

And jeans?  Don't get me started on jeans!