[Skarg]

Not in TFT, except in an Interplay article about heavy winter clothing.

Unless they're magical, in which case the only rules are about the magic enchantment.

(There are rules in GURPS, but GURPS treats armor differently from TFT.)

Personally, I would say they would need to be tailored properly to do that, and then the effect would just be adding everything: hits stopped, weight, and DX penalties.