1) An abbreviation for clothing.
2) A unit of thermal resistance defined as the amount of insulation required to keep a resting man comfortable at an ambient temperature of 21C. This is approximately the amount of insulation required for indoor clothing.
- Fairchild's Dictionary of Textiles, Phyllis G.Tortora, Robert S. Merkel (eds.), Fairchild Publications, New York City, 7th edition, 1996