When outdoors, wear a bathing suit and a cut-down T-shirt. Take an inch off the collar, then cut off the sleeves, carrying a big oval cut almost to the waist.
When you stand in a breeze, the shirt will wick moisture off you, then flap the cooled shirt against you—so you'll stay cool. I even putter in the morning sun. Yeah, you'll look like hell. No shoes. Drink tons of water or iced green-tea. Orange or black tea leads to kidney stones.
If you sit, sit outdoors in the shade, but keep the breeze flowing.
The above said, the wind-chill in New Hampshire Friday was 36 degrees.