Here's a wool (or wool blend) long underwear set from the 1940s. These are US military issue. The top is long sleeve and pullover. We found these in the south & the pants appear to be virtually unworn.
Military long underwear - Gem
BayouLife Magazine September 2021 by BayouLife Magazine - Issuu
Military/Landgirl 1940s 100% Wool Vintage Clothing for Men for sale
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Vintage WWI/WW II Men's Long Underwear Drawers Button Front Lace-Up Back Size 42
40s pre ww2 wool - Gem
Traditional Long Johns With Yoke/button Front and Brace Tapes
VINTAGE Military issue Long Johns w/ Brace Tapes. button front and
WW2 M-1938 Canvas Leggings –
Everyday 1940s 100% Wool Vintage Clothing, Shoes & Accessories for sale
militaryharbor WWI M1907/M1910 German Wool Field Tunic II-XS
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1940s Vintage Clothing for Men for sale
40s pre ww2 wool - Gem