It’s one of life’s great mysteries. Why wear a jacket when it’s 89 degrees out with full humidity? The answer is as obvious as the question. Because, damn it, we can. But that doesn’t mean you can’t keep as cool as you look. Pushed-up sleeves give a relaxed, rakish vibe to a blazer or suit. It tends to make a guy look less fussy and precious. You shouldn’t be afraid of a few wrinkles—especially in summer.