So I have to ask: Why didn’t you ask this at the start of the summer so that your fellow men might gain some useful knowledge when the weather would make said knowledge actually, you know, useful? You have got to work on your timing.
This one is easy. Get yourself to a store than caters to the skater crowd. Really. The absolute best choices in full-length summer-weight trousers come from the brands like Hurley, Quicksilver, and Billabong. Strange but true! You will find any number of pieces in lightweight fabrics and subtle patters that make a great foundation for anything you want to pair it with up top. Just remember to keep them pressed (it makes a huge difference to how finished you look in the summer) and stay away from big in-your-face layover graphics or embroidery. Subtle and neat are your watchwords here.