You can write your topic however you want, but you need to answer these questions:
What do you want to achieve? Keep it simple and clear!
so in this image is how the mesh looks (in accessory form) when it’s not put into a character
What is the issue? Include screenshots / videos if possible!
but when i put it inside a character it looks like this , even though the back part looks fine
What solutions have you tried so far? Did you look for solutions on the Developer Hub?
i tried double sided and messing around with the geometry but i don’t really know what’s making it do that
After that, you should include more details if you have any. Try to make your topic as descriptive as possible, so that it’s easier for people to help you!