+1 for tts. Get the same size as you wear other OL shirts, or BoO -1. Slightly more relaxed than Gitman in the same size imo. Hmm...now i'm confused. I wish I could try this on in person. I definitely don't want an oversized sweatshirt. If i'm a medium BoO, and small Gitman, you all think a small OL Great Sweat will fit me properly? Someone on this thread was complaining that the sweats are running big this season.