Yes. Dirty clothes have more mass than the same clothes after the laundry. When they are dirty, they may contain dirt, dead skin cells, perspiration, and other substances - all those have mass.
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The authors concluded that women can subtract 1.75 pounds and men can subtract 2.5 pounds for their clothing (without shoes). So next time you're getting weighed in a clinical setting, be sure to mention to whomever weighed you to subtract 1.75 pounds for your apparel.