I spent most of today working on my Fallout 4 idea for a Captain Cold/Mr. Freeze type character, who specializes in using cryogenic weapons. I came down to three different looks. All use white combat armor, but each has a different undersuit:
Vault Suit
Engineer Armor
Nano Suit
I am leaning the most toward the Engineer suit. But it has more brown than I prefer. I like the Nano Suit, but I am already using the white variant with Aurora. It does look good though. The blue of the Vault suit also works well for a ice-based character. The leg looks a little bare. But I could change the combat armor leg style to have a piece over the thigh as well as shin.
The Vault Suit with more armor pieces I think I liked it better with the lighter armor in the original Vault Suit pic