Lycra, spandex or nylon leothards and/or tights can make you sweat like crazy during very hot days. The solution, tightless leothards. I wore those like that and it worked out just fine. I still wore leggins sometimes but just to make sure that I was warming up my muscles correctly. I also wore a very thin fabric type of jockstraps or thong underwear because the dancebelts could have expose my testicles to a very high temperature and that could be somehow dangerous and at 17, and being liked by several nice looking females, you don't wan't nothing to harm your reproductive system.
When you excercise, your body temperature goes high and during summer and no air conditioning everything turns disgustingly hot. The only problem is that you keep sweating and if you wear a white or light colored leothard, your dancing apparel can become somehow "see thru" and in my case, with either my jockstraps or thong underwear, sometimes, my human anatomy, besides dingling, could be seen clearly. Though, I don't go for that, I rather make other people talk about my dancing attire than suffering from a heat stroke or something worst.[/i]