Which is warmer - a "TANK" or TREWS ???

[gilmore]

Puffer,

Thank you for doing the research. I think the warmth of the tank is the warm air chamber between the kilt and the body. Much like why Norwegian fish not underware works. With trews, there is not as much room to hold the warm air. OR, maybe I"m full of hot air.

...

No, you are correct.

The warm air next to the body is far warmer than pants.