Concrete Catwalk: Chris Thile of Nickel Creek

Spotted: Performing last night with Fiona Apple in Central Park

What we like: The light pin-striped blazer with a matching gray tie, black shirt, mussed-up hair and mandolin is a little bit country...and a little bit rock n' roll.

What we don't: The dark blue jeans with the black shirt. If you're going to wear a black shirt with jeans, there should be enough contrast between the two colors. Choose a lighter denim wash.