>>788761you're 100% correct sir!
I have a jacket/shell (unfortunately, just waterproof), and i bought it M size, it's good for one layer of Fleece, or a thin wool layer underneath the fleece, but I would be better if i had bought it one size bigger.
Other thing is I don't know if a goretex would help in this situation, but the sweat build up on my back, when i take the jacket off it's easier to feel it.
And when i'm with a thing plly/cotton layer as an outshell, it seems is helps a bit.
I only wish i Coudl buy this (pic) here in Brazil