Layer up!
There is now a full coat that is wired for heat vest arms and all...I wouldn't have known about it except it was on the news about the lady trying to get through the airport and they took it very seriously and shut down the area and finally figured it out...I'd seriously wear GORTEX, and gortex gloves, or the heated ones. I hear that the new Army underwear is a synthetic tha tis like dry wick an dworks really good...but I haven't used it...i'll order it in August to make sure tha tI get it in time from Fort Leavenworth Army AAFES...