just got the jacket from usps.
Fit is essentially slim fit for a jacket. I'm 5'5 medium build and its just about a perfect fit with one or two thin layers. I love that the arms are the right length and not 2-3 inches too long as with most jackets. This is a fall weather jacket or equivalent to the TNF bionic to me....so usable into the upper 40s assuming you're not just standing around.