I must have headrest added to this chair. The attachable type that can be purchased online would not work on this type of chair. Any help is appreciated. I need it to look nice for office environment.
If your office chair (brand) manufacturer has that model available with and without a headrest, there's an excellent chance you could purchase the accessory and retrofit it to your chair.
You could purchase something similar to this.
It's a Lorel high-back chair headrest and attach it to the back of your chair with screws. It's a mesh design but doesn't look too too-bad (opinion).
Two illustrated methods with step-by-step instructions for making and adding a headrest can be found here; but, functionality is stressed over appearance.