"It's not so cold and windy today, so I'll forgo the balaclava and go face commando." "Wading across this icy river makes me wish I hadn't decided to go foot commando."
Note that usage (1) is a special case of usage (2), with underpants the inferred item of missing clothing.
1. Not wearing underpants.
2. A state of vestment that leaves certain extremeties exposed or unclothed (used as a modifier), as in:
"It's not so cold and windy today, so I'll forgo the balaclava and go face commando."
"Wading across this icy river makes me wish I hadn't decided to go foot commando."
Note that usage (1) is a special case of usage (2), with underpants the inferred item of missing clothing.