Cloth users can transmog to other cloth heads.
Leather, Mail & Plate needs to use a cosmetic head to transmog goggles.
You do need to do a small "glitch" at the transmog NPC tho.
Quick Tutorial:
1. Open up transmog with leather helm equipped (or other armor type depending on ur class)
2. Choose a cosmetic head as transmog.
3. Equip the goggles and press the red apply button.