go commando

verb3

1. •
   To not wear underwear (chiefly underpants) under one's outer clothing.

   • Ross: … why do you have to wear underwear tonight? Joey: It's a rented tux, 'kay? I'm not gonna go commando in another man's fatigues. — 1996
2. •
   To forgo standard protections.

   • I was one of the only soldiers out there wearing hearing protection; all the rest just went commando. — 2005
3. •
   To forgo something usually considered standard equipment.

   • Coding Horror author Jeff Atwood believes, “One of the quickest ways to increase your productivity on the computer is to go commando: stop using the mouse.” — 2015