Attending a Kentucky Derby party this Saturday and don’t know what to wear? For women, it’s pretty easy: some kind of sundress and the biggest, most ostentatious hat you can find. But what about the gents? Thankfully, the bros at The Art of Manliness have put together this classy guide to Derby-appropriate menswear. So, dig out your breathable, light-colored trousers, preppy staples (Madras, boat shoes), and straw hats while you pre-game on mint juleps. Oh, and before you ask — yes, you have to wear a jacket. Click here to see a larger version. [via Coudal]