permanent fresh
adj. Describes clothing that has been treated with an antimicrobial coating to keep it free of body odor.
In Seattle, a textile company is working on an anti-microbial coating that will give clothing lifetime protection against bacteria and micro-organisms that cause odour. The permanent fresh treatment is similar to permapress. When the coating starts to fade, it can be restored to 100 per cent effectiveness with a special chlorine solution, they say.
—Mary K. Nolan, “The underarm odour issue,” The Hamilton Spectator, September 18, 2000
1999 (earliest)
The first "permanent fresh" socks, underwear, and other garments that stay body odor-free for days without laundering are headed for department store shelves, thanks to a major advance in textile technology reported yesterday.

Just as permanent-press fabrics incorporate a chemical coating to reduce wrinkling, their permanent fresh counterparts have an antimicrobial, or self-sanitizing, coating that prevents growth of bacteria, viruses and other micro-organisms.
—Michael Woods, “New fabrics odor-free, self-sanitizing,” Pittsburgh Post-Gazette, August 24, 1999
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