I've been experimenting with hats. Specifically .Obj to Garment import feature in MD. The idea being as a garment i hoped to be able to add and adjust the hats as clothes rather than an accessory.
The hat seemed to export from MD ok, them import into Sansar fine, but when it came to wearing it, the client pauses then crashes.
I guess such an item could be sold on Sansar Store as a griefing weapon.
I attach the MD file for my Crashy Cap for dissecting.