Hot yoga is a great sweat it out method to slim down, lose weight and reduce cholesterol. Just keep in mind it would be very unhealthy to do this on a frequent basis as you could run the risk of dehydration.
The usual lightweight clothing, anti-sweat athletic wear that dries quickly will do just great. For men its light tees with shorts and women can wear a tank top or sports bra with shorts or lightweight pilates memphis yoga-style pants.
I also notice new muscles that weren't there from my previous yoga practice. I must have created them during hot yoga. I feel stronger, especially in my lower body. Now I get out and walk around the park more. It has inspired me to get out of the house, and that is certainly burning more calories.
Is it a coincidence that only a fraction of teachers give themselves permission to really enjoy a teaching career without risking burn out or facing financial uncertainties? And have you noticed that most happy yogi/nis teach less, travel the world, get paid handsomely and inspire at least 10 times more than an average Yoga teacher?
The hot yoga letter R stands for Revelation. As you read this today, get a Revelation! It's your responsibility...no one else's. It doesn't matter who you are, where you came from, how much money you have...get a Revelation. YOU can and will create Miracles!
This is especially true for those who live in very cold climates. Get there at least 10 minutes earlier than the scheduled time of the class so you'll have plenty of time to sit in the hot room. This is necessary for warming up the muscles. As you know, warm ups are very important during workout as they prepare the muscles to minimize injuries. For a quicker warm up, do a few sun salutation poses.