I've read the following:

No, L armor doesn't decay when equipped/unequipped.. Same, apparently, with the L clothing from the THING.


And I wish to know if it is true that the L clothing I got from doing the THING quest doesn't decay when equipped/unequipped

hi, the arctic clothes decay when you put them on and off, so when you do it too often they cannot be put on again as they are (L) not repairable.

(L) armor in difference to clothes is not decaying.