A blue blazer with shorts might not be the most trendy look, but it definitely works. The right shorts are key, of course, but there is a wide variety of workable choices. Currently, plaid shorts that are a little fitted are popular. Pair them with a polo shirt, blue blazer and some flip-flops, and you have the perfect casual-day outfit for the mall, the beach, a friend's house or the golf course. A tan or olive pair of shorts will work, too. Avoid denim shorts, though.