Small fit. I usually take a large but ended up getting a XXXL. With a fleece liner the XXXL is snug. I'm 6 ft 195lbs 45 inch chest 34 waist and wide shoulders though. Even still the L I got first fits my 5 ft 105lb wife ok.
The quality is top notch, well made. Very useful field coat.

This is a size XL Regular (fits as expected) poly/cotton field jacket that reminds me of a light version of the M-65, without a hood or removable liner, and with some improvements, like a waterproof/resistant liner on the inside, plenty of velcro on the shoulders and chest for patches, large British style buttons which are very secure, more pockets, underarm vents, etc. Drawstrings at the waist and the hip. MOLLE at the lower back / lumbar region on the exterior. The color is more coyote than khaki, so expect it to be darker than pictured. I got this to have a rugged jacket to wear over a sweater or fleece while riding public transportation, and it could be overkill because people seem to wonder if I am wearing some kind of uniform or something. But I have never seen anyone else wearing this jacket so I'm down with it.

Great looking field jacket or more like a British Smock. USA my size is a 2xl. These are in EU sizing and is about a US med. or large. Gave it to a friend Med. size and he loves it.

You do need to order a size bigger than what you normally wear, other than that everyone likes the jacket alot

Love it, tons of pockets, well built and looks great. I did have to shorten the drawstrings, they were pretty long for my taste, but on the other hand they give you enough to have it the way you want it. Only complaint I have is that on Amazon these items aren't listed with the size anywhere in the title or description. I had to compare the model numbers off another website in order to be sure I was ordering the correct size. Best price on the interwebs though so it was worth the extra effort.