I have been trying to find some comfortable clothes to practice in, specifically shorts. I think this is a challenge for everyone, but i would hazard that it's even a little more difficult for men, since there can be the potential for... um... "uncomfortable bunching."
I just recently got a pair of Prana shorts , and I have to say these are not only exceptionally comfortable to work out in, but they have to be some of the most comfortable shorts I've ever owned. I also got a pair from their organic line which are very nice as well. But they are amazingly forgiving and don't get bunchy or uncomfortable. They are a little pricey, but worth the money, imop.
So guys (and ladies,) if your looking for a well-made, comfortable pair of shorts to do yoga, loaf around, hike, or just live in, check these out.