The odd part is that all of the pieces of clothing are in a different language and the person's name is 'Player' In Mariokart, I think that is what you are named while using a guest mii. I don't know if you can use a guest mii in Splatoon, but if they had an NNID, paired it with the guest mii, and started playing, as guest miis don't save progress, it would not save the clothes the inkling was wearing and so it removes the clothes. Of course, I now near nothing about any of these things, I was just trying to contribute. So if there is an expert on this, help me out.