Before I got my RN I was a sitter at large hospital. When I first started working we had to wear the blue gowns for EIGHT STRAIGHT HOURS with our contact precaution patients. Often it was a C. Diff case with many incontinence changes, linen replacements, etc. So sweaty, so gross. They passed a policy after about a year that limited us to 4 hours of isolation at a time, which was an improvement but still less than ideal.
Despite the sweaty-ness I would think from an administrative point they would be cheaper and at least as effective (perhaps more?) at infection control.