Nomex flight gear
The U.S military (and some others as well) use Nomex flight suits and gloves, and in some cases, flight jackets as well.
Contrary to popular belief, Nomex is NOT fire-proof. It is fire-retartant, and will burn eventually, given time.
Military flight crew are required to wear them in case of fire, especially cockpit / electrical fire. Imagine you're not wearing gloves and a fire breaks out near your flight controls (I'm exaggerating)... it would be quite difficult to fly the aircraft then...
I am a former military pilot, and now undergoing commerical training, and I still wear my gloves to fly. Also helps for your pre-flight checks... dun wanna get cut or anything when checking the plane out... Frankly, I think it is a good idea to wear them to fly.