I found a dozen over two dozen items on Etsy that I really like, and so far, all of the sellers whom I looked into are donating proceeds to related nonprofit organizations! I verified one of them, which led me to continue seeing what's available there.
I found trans flag pins and shoelace charms, trans heart and rainbow pins, trans decals, trans striped ribbons and shoelaces, and trans striped hair scrunchies. I found items that say, "I'll go with you," "trans women are my sisters," "ally," "protect trans lives," and "trans rights are human rights." I want to wear them all at once so no one can overlook them!