The M-65's design is full of utilitarian details, including extended box pleats on the back for ease of movement and a snap-up placket covering the zipper to prevent a crawling soldier from getting snagged on the ground. Many of these same details are flattering to the wearer, such as a built-up collar and a pair of midsection drawcords that give this otherwise boxy jacket a proper waist. Modern M-65s are made in a variety of colours, and the best designs are still the most authentic. Obviously you want to avoid camo and olive; black, navy and khaki all look great. Some of the best-made M-65s come from Alpha Industries; interestingly, their hard-to-find American-made coats run about $80 and since they started manufacturing them in China pricing seems to have gone up to around $125. Not quite sure what happened there.
Important sizing note: these things run REALLY big. Seriously, if you wear a 40 suit, you'll probably be more than comfortable in a small. So size down by at least one unless you want to wear it as a droopy-shouldered tent like De Niro did in Taxi Driver.