long underwear

a close-fitting, usually knitted undergarment with legs reaching to the ankles, as a union suit, worn as protection against the cold.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
If you'll be camping, add synthetic thermal long underwear and wool socks, and
  make your jacket thick synthetic fleece.
Agee says that there is a pair of long underwear hanging on a peg right next to
  the bed.
Wool or synthetic trousers and long underwear will help to keep your legs warm
  and dry in deep snow.
Dress in layers, including lightweight long underwear with an absorbent layer
  of insulation.
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