Neidermeyer

In my experience the trick is not simply to wear something thin and smooth (many of the suggestions here work for that), but also something that is thin and also doesn't leak in the event you finish before the end of the song. The only thing I've found that accomplishes both (thin and leak-proof) are gortex rain pants. They are thin and smooth, and absolutely no liquid will seap through. You can also find gortex golf rain pants that look somewhat classy - they don't look like athletic pants. The only downside with gortex is that it's fairly pricey. Hope this helps.