Different folks require different clothes based on a lot of factors.
Some guys like heat, some like cold.
Last evening it was reainy and around 40-45.
I wore my Minus 33 merino medium weight underwear with my medium wt. Asbell Anorak over it and my light weight early season suit, then my heavy weight Asbell zip jacket over that. It was just right.
Then again I am 5'7", 140 #, no body fat,and always tend to get cold easily while sitting motionless on stand. Nothing ruins a hunt like a bad case of the shivers.
I wear all that and more then slip into my HBS when it really gets cold here.
In Florida, when pig hunting and stand sitting in 30 degrees, I wear a light weight hunting suit over a tee and a Pendelton shirt, then top it with insulated bibs and insulated jacket.
Florida is seldom like that, but when it is, it wouldn't hurt to have the heavy weight stuff like Whip says.
Just my $.02