re: On wearing canvas suits and why...
Cooling is an issue even with the canvas suits at MDRS it being in a desert. And solutions seem to be either to expensive, to heavy, to cumbersome or force you to remove the suit part way or cut pockets in them.
I was planning to use the low pressure analog suit at FMARS or at MDRS only on cold days. It would play havoc with the methods we usually use to cool ourselves down. Later I would introduce something like the liquid cooling garment used currently by astronauts in spacesuits.