Yes, apparently naked yoga is gaining popularity across America. As reported in this AP story the other day:
A few classes are coed, but male-only gatherings tend to be more popular and have become a mini-phenomenon in the gay community, with studios in Boston, San Francisco, Los Angeles and Salt Lake City. A studioless group in Chicago practices in the apartment of a nude yoga enthusiast.
Fans say the nudity aids in deepening their yoga practice while building a close, and emphatically nonsexual, community. "A lot of people, especially living in New York, don't get the opportunity to connect with people in an intimate way," said Aaron Star, who started the naked yoga movement.
Not exactly my cup of tea, but if someone's practicing yoga then I guess that's a good thing no matter what they wear -- or don't wear.