The other day I posted several guys wearing unconstructed jackets and shorts - I think they all looked great.
A variation on that theme is the idea of a very structured jacket and shorts.
Personally, next Summer i think i will try a more structured jacket like the one above when I am wearing my shorts in Milan (gasp! shorts in Milan!).
This Summer I wore a lot of unconstructed jackets but I find that for my shape an unconstructed jacket is too shapeless and makes me look square. Well, I guess you live and learn.