Depends on what you're comparing to... went with a medium as most of my shirts. But took a large for Baker jackets, medium for Bedfords, and medium for Expedition. So I'd say go with the same size you'd take for your shirts and Bedfords.
Patches are awesome, which is what makes eg cool, if not, it'd just look like something of a hand me down from q great great grandpa lol. Eg's fw stuff is always just a updated modern version of traditional stuff.
@mbaum ya, I don't know how you can even wear more than one layer during this socal weather, it sucks I know because I picked up 6 jackets for the ss14 season, and haven't really had the chance to wear them because it's too hot, but they'll come in handy for us socal guys this fall.