I own an assortment of linen sportscoats, as well as two safari jackets. I find they're handy for work (they're modeled after a military battle dress jacket of old) and travel. They're also fairly close in style to a normal sportscoat, so I can wear them to the office on casual days.
Yes, I recognize part of the appeal of a sportscoat is to avoid "casual" appearance when one wants to dress down, but a safari jacket blends practicality with fashionability.
Single and double breasted navy blazers, with gold buttons of course. It's a staple for me, along with anything seersucker. I quite like a tan seersucker sportcoat with black trousers too. (wear it with a striped knit tie and you're good to go)