I would prefer dark grey but I am almost always night hunting in a black Carhart jacket with a camo turkey vest with a hanging seat.
At night, especially with snow, everything is black and white and I always try to sit up against something dark and then you blend right in. Ive had luck wearing nearly all black even out in the middle of snowy fields, If you can sit up on a higher spot with a dark tree line even far behind you, you will blend in with the dark tree line. If you are wearing dark clothes you will blend in with anything dark behind you, close or far away.
I believe the Swiss military is or used to do white legs and green tops, theyre in the snowy evergreens. I never tried that but I like the idea of white pants and dark top.