Why astronauts wear antibacterial materials?

Why do astronauts use clothes with silver?

Thanks to the silver fixed in to in the fiber is clothing antibacterial. Which means that silver kills bacteria, which arise, for example,from sweating. Thanks silver sweat doesn't puch. 

Spaceships do not have washing machine, so astronaut need clothes that allow longer wear and natural smells.

This functional clothes are favorably work for eczema, acne, mold and mycosis. These antibacterial properties allow longer wear and less washing.

This makes nanosilver clothes a great addition not only to space but also to traveling and sports.