Reverse logistics.

Everything that happens after a customer sends something back: authorising the return, deciding who pays the inbound freight, receiving it, inspecting it, and settling its disposition. Disposition is where the money is, and it has four normal outcomes: back to stock, to refurbishment, to liquidation, or to waste. A printed one-off has access to the last two only. The shirt carries another person's name, so it cannot be restocked, and the shop absorbs the blank, the ink, the labour, the outbound freight and often the return freight, then reprints from zero. Which makes a POD returns policy really a proofing policy: the cheapest return is the one prevented at approval, and shops that handle a defect claim separately from a change of mind (photo evidence, reprint, no physical return) lose less than shops running one blanket rule.