sizing for me is generally pretty consistent, but you also have to keep in mind that not everything is intended to fit in one way. some pieces are meant to be very slim (blazers, for instance), while other pieces are meant to be oversized (bomber). kinda depends. if you're unsure, definitely size UP on things like shirts and any tailored stuff. the jackets are all real snug in the shoulders. and with the slim jeans, if you're worried you're between sizes again definitely size UP.
edit: actually, with the slim jeans it might be worth sizing up anyway. I'm normally a 30 but wear a 32 in the slim jeans. Edited by pickpackpockpuck - 1/17/13 at 12:00pm