I have a sniff test and a dirt test. If it fails either one, an item goes into the wash.

However, most days I'm home at my bead desk or on the computer, and unless we're mid-summer, I can wear things a lot before they need washing. (And no one really sees me, so I don't care.)

We're in semi-desert climate and under drought conditions more often than not. It seems ecologically untenable to wash clothing after every wearing.
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My handcrafted jewelry:
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Poet and essayist