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.

(The Clothes)

Push—don't roll John Edwards style—the sleeves a quarter of the way up your arm. They shouldn't creep past the elbow.

I've been seeing a lot of cool gentleman wearing pushed-up sleeves."
- Scott Schuman, The Sartorialist.