Most Helpful Girl
Stretchy can be worse for hot weather the baggier the more air flow. The tighter the more restricted and likely you are to sweat. And as far as that if say there are levels of. You want it to be tight enough to show a hint of definition but you don't want it to look painted on to you.
My guy is very buff he's 5-11 and about 210 of muscle. He wears large or extra large. So it's fitted on arms and chest but not too tight. That looks best to me. Tight all the way down your torso looks douchey to me