Go for the wool vests. Paul I'm a 40-41 and the M fits me perfectly snug with a medium weight sweater. Tough to say if you would need xs or s with a heavyweight sweater but a baggy vest doesn't look good so I'd say xs.
The more I look at the Cali winter jacket....the more I want it.
Does anybody own this or tried this on....what is the weight like? Could I get away with wearing this in Philly weather?
The other option is to grab one of the wool vests but i already own the Navy one.