Hula Skirt Set

I am in the middle of planning an event for work, an outdoor picnic. We have somewhere close to 500 employees. Part of the event is that there will be a ton of different games...kickball, volleyball, softball, bags, etc. We are setting up teams prior to that and we want something that we can get that will identify each team. We thought schrimage vests, but they are pretty expensive. The theme we are going with is beach vacation. I thought Hula skirt to make it fun and funny, but any other thoughts would help. Got any ideas???