Not a monster, but 6'2" 230 .........
I layer my base layers.
Team Realtree heavyweight tops and bottoms from Wally World against the skin.
Easton Core 4 Element Mid-Mountain top
A polypropylene sleeveless union suit from Sportsman's Guide over that
The union suit eliminates your tops and bottoms from separating during movement and giving you the cold draft up the back.
I stay VERY cozy.