"Jote mon gave permision cooler listed that permision"

That's not actually the case. Cooler quoted this from Joat Mon's readme included with the corset:

"The geometries are my creation and are free for you to use. They are not for sale and by your using them, you agree not to sell them or include them with anything for sale. If you want to include them with a character that you create, please include this text file along with it. If you render an image using any of the models that I have made, the images belong to you and you have all rights to those images. When I see one, I'll get a kick out of it :`)"

It says "free to use". It also says they can be included "with a character that you create" although you cannot "sell them or include them with anything for sale". That does not state it can be modified nor does it state it can be distributed separately from a non-commercial character you created.

Even if there weren't copyright concerns, IMHO, the right thing to do would be to let Joat Mon know what he was going to do and ask for permission. It's hard to believe Joat Mon wouldn't have been thrilled and would have given permission without a second thought, but, it can't just be assumed he would.