Had a chance to try on the Large and the XL fit me much better. Large was too tight across the chest. I always wear a large. Jacket is great otherwise.
I love my M65 but after trying on a large and XL I sized up to an XL as the large was tight around the chest area. I always wear large. Food for thought.
Just received my M65 and it's a great jacket. Anyone who wore the old field jackets in the military will find it very familiar. And for me that was a big plus. I've worn it on duty and off. It's light but easy to layer with a sweatshirt or a fleece. It seems durable and up to 5.11's high standards.
My only (very minor) complaints would be the lack of interior pocket and the lack of color options. The available colors do cover the bases but a few more options are always great. I chose to go with black but I'd like to see charcoal, storm, and/or OD green in the future.