You check the other bags.

You look in the last two bags. One contains more of what seem to be Kako-sized clothes, and a full-body spandex suit that you could possibly fit into. The last bag contains lacy underwear in your size. Thongs, bras and even panties that cover more than they reveal. At the very bottom, you find a shipping receipt. It is from the same company you ordered Kako from.

Looking over the piece of paper, you see two items. You recognize part of one of the item codes, 'SMEXXL', the same that was in Kako's item code. The other has a similar 'SMEXXXKSE'. Apparantly you will be having two new guests in five days.