A few years back one of our eager gliding club members did his five hour endurance flight on our local ridge....in FEBRUARY, in a K8, which is exceedingly draughty. History does not record what he was wearing....
An Ozee suit is de reiguer when standing around on the airfield in this weather....long johns, wooly jumper, ski pants, furry boots, russian hat and of course, your white silk scarf.....
My personal preference in this weather would be flying the tug, which has a heater......
Or flying in Florida....