Heretic speaking here: I bring changes of clothing!
Dry socks for sleeping (liners or wool, depending). Extra liner socks, wear one pair while the other is drying after washing. Extra underwear for the same reason. Sometimes lightweight short pants to wear at night. Spare t-shirt for sleeping.
I want to be able to sleep in reasonably fresh, non-sweaty, non-salty clothes at night, and I don't want to wash clothes every day. All this doesn't add up to much weight-wise (4 oz shirt, 1 oz liners, 3 oz short pants, etc). So maybe I carry an extra 1/2 to 3/4 pound in spare clothes, I don't care.
Note that I have somewhat sensitive skin and have found that having fresh clothes at night helps avoid chafing and rashes.