I like the fit of everything here. Being on the huskier side myself, I never wear sweaters underneath my jackets as I feel they tend to add more bulk to an already larger frame. Same with tweed or heavy looking fabrics. Just my opinion, but everything does fit well including the pants. Guys with fuller legs should never wear slim fitting pants, regardless of whatever anybody else says.
+1. Anyone that's not stick skinny should not wear slim fit flood pants.
p.s., DonC I think you really need to go for unstructured jackets to soften your upper frame. And sweater under jacket looks really bad on you, accentuating your girth. Maybe a solid and inconspicuous one will serve you better.