Most Helpful Guy
Ladies, here's a secret . . . GUYS LOVE WOMEN IN SWEATS.
No, I'm not kidding. I swear to you, there's something sexy about a woman in sweatpants or lounge pants, and I'm not talking about the "I'm a whore" sweatpants with the brand names and sayings embroidered on the ass (those things only get in the way, actually). It tells us that you're not self-conscious about being comfortable in your own skin. We like a woman who knows how to lay back and relax every once in a while. Just ask my wife.
Most Helpful Girl
Depends on the guy, I bet. Jeans and T-shirts probably don't work though if you are trying to catch his eye. I'd go with something tight but not skimpy.