i mean i didnt make a hat but i already got the .mesh and .png thing when i like try to import one to novetus studio it says version error thing
(Since i changed the rbxassetid thing of another hat)
Follow this guide, and make sure the hate you use is 2016 or less.
https://github.com/Novetus/Novetus_src/wiki/Creating-new-items-from-Roblox