Add Accessory to custom mesh avatar

Hello!
I imported a custom avatar and made it playable. But I want to add some clothes to it and I don’t really know how to do them properly.
I tried to create accessories and attach to the character but once i play the game this accessory dissappear.
Here my structure in the studio:

Accessory:
image

Avatar:
image

Accessory is now in the workspace and character is placed in starterplayer.
Thanks for your help! :smiley: