Same exact thing happened to me, all of my armor disappeared and I am wearing armor I had a while back. I had tier 3 cultural gloves, and the rest was stuff I bought.
I have the same problem, I have sold and not received the gold for it. So I removed the other items i had for sell, and although they disappeared from the selling menu, they did not show up in my inventory either, so when I hit remove, it completely removed the items from existence.
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