Ideas for cabin unity at a middle school camp?

I am going to be a counselor for a middle school church camp this next week. I will have a cabin of seven girls for the week and I am wanting some kind of cabin unity thing that I could bring for them to show off the awesomeness of our cabin. I was thinking bright and flashy t-shirts but I have no way of knowing what sizes to get because they don't tell us until we get there. Any ideas of things that are somewhat cheap that our cabin could wear that is really noticeable and stands out? Thanks! =)