I finally tackled the multi-decade pileup of T-shirts. All of the cotton shirts got turned into fabric scraps for the textile BB (https://permies.com/p/2959399) and the not-so-cotton shirts got turned into rags. I made sure to cut out all of the designs for sentimental reasons. The backs, bottoms, and sleeves became rags. I didn't do anything special to them, just cut them up.
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These are all the shirts from the collection that were some sort of polyester blend.