After the latest Final Fantasy XIV patch, you need to unlock Facewear before you can equip your Spectacles on your character. Here is everything you need to know about how Facewear works in FFXIV Dawntrail after Patch 7.0.
How to Unlock and Equip Facewear in Final Fantasy XIV: Dawntrail
To unlock Facewear in Final Fantasy XIV, you first need to purchase it from the NPCs or the Market Board in the town. Here are some places from where you can buy the Facewear: