Need help?

[EllyFox]

Still, I want to create new beautiful things. I spent so much time searching for information, but didn’t find anything useful.
Can anyone clearly explain how to transfer clothes (for example a dress) from blender to the game? Or is there some kind of working manual on this issue? I'm interested in the option that works on v11. Thank you!
Ideally, of course, there is also a hint on how to properly prepare a file in blender for this.

Creating clothing (and hair) for TK17 using Blender is a rather involved process. I had to abandon by Tutorial Series after just "Toys" &  "Rooms" b/c I was never able to do it properly myself (I built one hair, but needed help doing it, and the result was not 100% compatible with V11.)

Things became even more confused after Blender switched to the new interface (which I still don't quite understand and thus continue to use old 2.79b.)

Fine. Many addons for older versions of the game are also suitable for 11. People used to create addons somehow. How did they do it? How did you transfer things from blender (even from the old version) into the game?