Heya!

Some suggestions for you:
  • Unequip the headgear
  • Set /display head on
  • Equip the headgear.
Not working?
  • Unequip the headgear
  • Set /display head on
  • Equip another headgear
Can you see it? If yes it's a Headgear's bug, if not:
  • Log off
  • Log on
  • Set /display head on
  • Equip the headgear.
If you're having issues contact a personal from the Final Fantasy XIV service.

Regards,

uh... myself?

... yup.

See ya!