Funny you should ask about sizing for the new Parka. Mine (a Medium) just came in and it's too snug. I'm just over 5'9" and weigh 175 (I know, I'm not GQ material). All the other jackets/coats I own are either Regular or size 40. Slacks I wear are size 34. I have a Northface ski jacket that is a M/M and it fits fine.

This new Parka, without the liner, fits OK. With the liner it's just a little too tight around the waist. Sleeve length is fine. If I had a sweater on and put this Parka on I suspect it would be way too tight.

If you want a snug fit, it would be fine as is. Mine is going back Monday for a size L.

MG2