What do y’all where when climbing at 0 degrees F?

Planing to go climbing up north and it’s probably going to be below freezing close to 0 degrees F. I have a light down marmot coat that keeps me warm but idk if it’s the most comfortable thing to climb in. What do you guys typically use for freezing conditions? I have base layer and mid layer and a frog togs shell. Should I get a fleece vest that I can throw over my mid layer?