The latest patch made adding new hair possible, but no one has done it yet. People have made mods that add wigs to the game, but I haven't done so myself. I do know that wigs count as helmets when making them, but that's it.

引用自 FlattenedJelly：

The latest patch made adding new hair possible, but no one has done it yet. People have made mods that add wigs to the game, but I haven't done so myself. I do know that wigs count as helmets when making them, but that's it.

Is there any way to see the like, image files for items or the body?

I believe a reference for that sort of stuff is on the Discord for the game.