So this hat was described as Aladdin or Genie Theatrical Fancy Dress Hat, I think that's about right.
Although it also for me feels like it would suit Indian cultural headwear as well
Made by covering a foam sponge substructure in fabrics and beads, it feels light as a feather.
A good fancy dress hat, however, I don't think very tough so not sure how good it will be where it will be worn multiple time such in theatrical use.
