Is it ok to mix the two materials? Neutral pants are the way to go. As for the outfits, they sound fine.
Wrangler Riggs Pants: Men's Charcoal Grey 3W045 CH Riggs Ripstop Technician Pants
Overall, I looked at 4 more studies. Two of them showed weight loss of a few pounds over a period of 8 weeks (9, 10), but the other two showed no effect (11, 12). So… unfortunately, the weight loss effects appear to be both weak and inconsistent.
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