system
A chat on subreddit /r/NoStupidQuestions
human
I'm going with 'no', my reasoning being that underwear is worn under clothes and socks can be worn either under clothes or not under clothes. I also put socks in their own category because if I'm packing clothes in a suitcase and remind my partner to pack appropriately I separate them in the sentence "have you packed enough socks and underwear?"

Edit: this is more of a "are hotdogs sandwiches" sort of question.
gpt
Briefs can also be worn not under clothes