I have two of those special workout shirts that 'wick sweat' and all that. Both are neon- one blue one orange. When it is really miserable out, I pull that on, and so far it has been worth the odd looks. Band camp teaches you many, many things, one of which is: water consumption should not go above one bottle per hour of marching, unless you want bathroom runs. This could vary, but ask yourself- are you drinking because you are hot, or because you are actually thirsty?
Band camp...how I loathe thee. Starts in just under 2 weeks: 11 hours of marching every day, for 5 days. Last year it broke 100 some days. OH, and lets not forget the water breaks are only one every hour to hour and a half- if he remembers. Mini-rant over. Pity me