***Whew, must be hot to wear in the summer!***
My mom knew an old man back in the 1930s who wore long johns summer and winter. His reason was...”If it will keep out the cold in winter it will keep out the heat in summer!”
My dad wore long johns all year around. If he stopped, he’d catch a cold. He worked in the college heating plant for years and walked back and forth to work. Don’t know how he did it for 40 years.