Etigoya has a save on his thread over in hongfire. It's in his signature here.
Also, since no one's said it yet, her full name is Leona Ru Do Dabitchi, AKA Leonardo Da Vinci. All her inventions are actually Leonardo's stuff and you even get a version of her starter Dabitchi bodypaint named Da Vinci. Here's a list of the stuff you see in the game:
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And a few more that I can't bother to find. Also, the pink haired maid's name is Mona and in the ending Leona finishes the painting sitting in her room. Huh, it's the Mona Lisa!
Also, if you're missing outfits, backtrack and use the "Idea Searching" (アイデア探し) skill and it'll tell you the location of where to go for some hidden bodypaints. It returns a general direction (left/right/up/down or some combination of either) and the total number of squares/steps away from you it is. (it'll reply "it's in front of you" when you're there) Some are hidden in holes you open up, either in the walls or in the ground (always denoted by a tile different from the usual ground, e.g a patch of grass or pile of pebbles). There's always a plugsuit in the water-accessed cave in the maps with them. There's also a bodypaint or item if you keep going down in the permanently monochrome dungeons (these are made for your grinding if you find yourself having problems progressing, though one of them is required to advance the story).
Remember to use idea searching multiple times! There may be multiple bodypaints in a map. It'll also lead you to bodypaint chests if there are any. Also, the final bodypaint is back at the top of the tower after you clear the game (not counting the extra dungeon clear).