I would err on the larger side with an outerwear purchase. too small cuts off circulation. you want some room to be able to comfortably wear a base layer and possibly a mid layer as well, depending on how cold it is. my mistake with ordering one that was too snug was not looking at the sizing chart before ordering. fyi, it looks like craft has a different sizing chart for their jackets than other clothing. it is a little confusing. i guess they are trying to encourage people to order one size larger than usual for outerwear.
found this review of the jacket here:
http://www.cyclingnews.com/tech.php?...inter_clothing