I have a Sub-Zero coverall suit that I bought in '75 from Sears for those cold nights working outside for the railroad. It had to be 10 degrees and colder before I could work in it without sweating. Wearing extra on my head besides a plastic hard hat could control the body heat too. I went to the military surplus store for a wool helmet liner for the super cold nights. A cotton helmet liner for the not so cold nights. A cut up pair of hose for the cool nights. In the early 2000's we had to wear a reflective vest when outside. The largest they would order was a 4XL. With the coverall and/or a rainsuit I had to stitch 3 vest together so it would be large enough.