Sleepingwear

This new sleepingwear is made out of Carlsbad processed fabric—a luxuriously soft and comfortable material for which we claim exceptional warmth. The garments meet all the requirements of winter sleeping comfort and can be worn as you wear any nightwear.

Source: wiktionary

Canton flannel was a fabric much used in the time of Crane’s boyhood for sleepingwear, undergarments, even sheets.

Source: wiktionary

Keeping your legs warm is also important. A lot of people are actually cold when they sleep. That contributes to muscle cramps and aches. Long, warm socks help. An electric blanket helps. Warm sleepingwear helps. Too much air conditioning at night does not help.

Source: wiktionary