Some of these are undoubtedly a gimmick that I’m terribly skeptical of, however, wool is indeed a material that really only needs washing when visibly soiled. It’s actually pretty remarkable how well it resists odor and keeps it shape. I love wool clothing, in the winter I wear wool base layers under my clothing and can get quite a few wearings in before washing them (though weeks and weeks and weeks would be pushing it). I also wear wool socks year round, though I definitely wash those after one wearing. Plenty of other clothing items need infrequent washing, jeans for example, pants depending on the material they’re made of, even blouses and dresses usually don’t need washed every time you wear them (especially if one makes use of slips and camisoles underneath).