Seems to me that carrying on clothes, shoes etc would be a heavy burden and take up packing space. If I am spending $$$ for a cruise, I would factor in the purchase price on board. Can the added cost on the overall vacation price be that overwhelming? How much does one really save BYOC?
t-shirts are plentiful and fine.…wash your undies in the sink.
By the way, any clothing purchased on board can be taken back to your cabin… or anywhere on board.