This is a recent trend I’ve heard of, people buying plastic clothes so that they can sweat more and therefore lose more weight when they are actually working out.  It’s not completely unfounded.  After all, if you heat up your body and turn it into a virtual sauna, you will burn off more weight.  The thing you need to keep in mind is that all that weight would realistically speaking be water weight.  It feels like you are getting skinnier and flushing out the pounds in so many ways. 

But frankly, water weight will always come back.  Over time, it can actually be quite dangerous, because you can easily get dehydrated and have other problems in general terms.  Water is the element responsible for keeping your body from overheating to some degree and for keeping it hydrated of course.  You need water, and to lose water weight is misleading at best.  But at worst, it can be potentially dangerous of course.  They reported in 1997 on 3 athletes who went to extreme measures to lose weight.  They wore plastic sweat suits while performing intense exercises in already hot environments.  All 3 of these particular athletes died.  So it’s something to keep in mind when you think this is the way to go.