Base layer, also called thermal clothing or thermal wear, is a style of two-piece underwear
with long legs and long sleeves that is normally worn during cold
weather. Base layer because it is the bottom layer commonly worn by people under their clothes in cold
countries. Longjohns is another style of base layer which is can be a one piece garment. Scroll down to learn more about base layers....
.....Thermal wear is often made from a cotton or cotton-polyester-blend
fabric with a box-weave texture. Some thermal wear, especially
longjogns which are often referred to as union suits, are also made from
flannel. A union suit is a
type of one-piece long-underwear or longjohn which was first made in
Utica, New York as women's wear. The Union Suit or longjohn is an
alternative to constricting garments, and its comfortable fit soon
gained it popularity.
Many manufacturers use wool blends or even 100% wool, especially Merino or other wool of superior quality to reduce the itch of wool. Modern thermal wear often includes a thin layer of polyester to which body moisture and transport it away from the skin.
A two-ply fabric of
either a wool layer and an artificial fiber or two layers of only artificial fibers is often referred to as thermal underwear or thermal wear. The double layers trap air and it is this "dead air" which also traps
body heat to insulate against cold air.
The one piece base layer know as long johns were first introduced in the 17th century across the Atlantic in England. They were first used as loungewear but then
later became popular as sleepwear. The the comfortable, lose fit of long johns made popular and by the 18th century they had become common sleepwear throughout the civilized world.. T
The name long jonhs may have come from a famous knife fighter who
fought in long underwear. Or perhaps the name came form the original manufacturer of long johns, the John Smedley's Lea Mills, located in Matlcok in Derbyshire, England. It is said to have created the garment, and with a 225 year heritage that is quite possible.
And, if not named after the company, then there is a story that says the company named them after the heavy-weight boxer of the day, John L Sullivan. It has been proposed that the "john" in the item of apparel may be a
reference to Sullivan, who wore a similar-looking garment in the ring.
This theory, however, can not be proved and the word's origin is