the t-shirts run a little small. the hoodies run pretty much normally, so if you wear a large usually, buy a large. the track jacket (what the birds thingy is on) runs large.
T shirts are cut a bit tighter than your standard hanes type tee. They aren't skin tight though. Hoods are baggier. The tall tees are cut huge like they should be...tall. I'm 5'11" and they are down to my knees.
I'll get some specific measurements up on the website in the next couple weeks.