Very helpful post. My first JAB acquisition was a 100% Camel hair sport jacket (also my first of this style) that I absolutely adore. Having upgraded my wardrobe over the past few months in preparation for a new job I have found my "sweet spot" for jackets to be 42S and for trousers to be 34/30. I definitely need a little more 'clearance' than the Slim Fit lines allow, but the Modern and Classic Fit clothes seem to accommodate my body plan just fine.
Tim
Tim