LOL! Now there's a mental picture I did not need.

A couple of other points:
Cotton kills, you'll be warmer if you don't have cotton on near your skin.
Keep something between you and the ground/seat/stand to prevent heat loss through conduction. Stand on an insulated pad or carpet to reduce heat loss through your feet.
Most heat is lost through your head, wear plenty on your head
It may sound silly but a stand umbrella will add a bit of warmth on calm days by trapping your escaping heat.