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Do you never sweat? Are the jeans antimicrobial or something?
I've done basically the same thing. Definitely passes the sniff test - somehow there's not much of a difference. Not sure if oil from the skin ends up becoming a antimicrobial agent over time?
How they're stored probably affects it some. I have better results hanging them up rather than letting them sit on the floor, even if I'm just going to put them back on the next morning.