Thank you!
I'm putting the graphic pack on hold for a bit, because I'm trying to completely rework the sprite system in order to implement different body types the smart way, and I'll also need to alter the clothes a little. But if people want me to post the new clothes sprites in the meantime I absolutely can.
I'll look into that bug, the hat shouldn't be available yet, probably forgot to remove a test script.
Regarding the custom clothes, I can't give a definitive answer, but custom sprites are on my "to study" list. The thing is, Game Maker is not very good at handling sprites from an external source, so I need to make sure it won't impact the performances too badly, and creating a set of custom clothes will be a lot of work for the users. I am also thinking of a way to be able to use 2D sprites the same way you'd use 3D assets, with a colorless model on which you'd apply a texture. In theory it could work and would make for a pretty easy way to modify outfits, but that would be a very long development and I'd possibly run into the same performance issues. So that's probably going to be one of the last features I'll work on.