This depends on if your character is sufficently sluttifed or not, if they are you should be able to just walk into town and buy items from one of the vendors, they are also a very very rare drop from some npc's in the later dungeons and they can also drop from chests as well, but again a very very rare drop, it has however been quite some time since I last played this so I could have got things a bit mixed up with other games.
Depends a bit in that case, if you have dungeons you have not looted all the chest in then you have a small chance of getting clothing repair items from those, though it is very small from what I remember, other than that no you are pretty much stuffed.
Does anyone know if there is an uncensor patch for this game? It looks good and the artwork seems good, but censorship almost always takes me out of the H-scenes. I like to see the body, not very fuzzy pixels XD
You could try to copy an existing file in that directory to the file name reporter in the error message.
If the file reported has the extension ".png", you may need to replace ".png" with ".rpgmvp". Whichever extension is customary for the directory that should contain the missing file.