What to wear for both: Navy uniforms, spotted with badges. This works best if one person is blonde and one is a brunette. If you're the blonde one, you're gonna have to grow a moustache or at least put on a fake one. Aviators for both.
How to act: If you're Goose, like you're really glad not to be dead. If you're Maverick, just be really, really intense. Serenade some people with "You've Lost That Lovin' Feelin'."