I'm on the slightly-larger size myself, 6', 205lbs, 42"/36", and the Large is an absolute, PERFECT fit. The coat has lots of little zippers & snaps, and you can increase the waist by about 2" by just changing a snap or two. I used my Columbia 3 peice jacket as a size comparison, and the Northface was just a bit smaller, but again, it fits perfectly!
Btw, I found the big reflector thing velcros on the back, but anybody know where the two smaller ones are supposed to go? (Not that I'm planning on wearing them.)