What should i wear to dress up?

I'm on the lacrosse team at my high school and Monday is our first game. And so our team is making all the players dress up nicely. And i don't really want to wear a dress. And we can't wear jeans so pretty much the only other choice is a skirt because i don't have any slacks and that would look dumb anyways. The only skirt i have is this grey, American Eagle skirt. It's like cloth.. not jean or anything. And i don't have any really dressy shirts that would match it.. would a regular white shirt tucked in look good? and my legs are to white and i haven't gone tanning yet.. so should i wear some black leggings with ugg boots? or would that look bad. If so.. what should i wear?