We knew the First Lady liked to show off her arms, and now we know she'll change designer dresses to do it! Michelle Obama first wore this Derek Lam coffee-hued printed frock with three-quarter sleeves for a dinner in Indonesia last November, but when she showed up to the National Design Awards in Washington, D.C. this week, she converted it into a sleeveless look. Talk about alterations! So, which style do you like better: With sleeves or without? Cast your vote in the poll below!