I bought the Conan bomber during the Boxing Day sale and couldn't be happier. For reference, I'm 5'11, 185 lbs and went with a medium. I would describe it as fitted with the pit to pit measuring at 24" across. I can comfortably wear a long sleeve Henley underneath and don't find it necessary to really layer beyond that. I could've gone with a large for layering but I wanted to avoid the puffy look. The medium hugs my torso perfectly and does a good job keeping me warm.
If you're looking for an alternativ to the other luxury brands out there then I highly recommend Canadian Wolf. CW down jackets look just as good, are made in Canada and have a better price point. Highly recommend.