Was this the article? I never wore the same underwear 2 days in a row. If it's not, I'm not sure why that guy would be stingy about underwear, since it is so lightweight. It takes up almost no room in a suitcase.

https://eubanks.medium.com/i-lived-out-of-a-suitcase-for-2-years-it-improved-my-finances-18517732b57a