Gnome goggles are a possible reward from the Gnome Restaurant minigame. Players can only obtain them as a reward from Captain Daerkin or Captain Ninto, which are accessible with hard deliveries. The gnome goggles are part of the gnome pilot set which also includes the gnome scarf.
Goggles can be combined with the Bomber cap from the Enlightened Journey quest by talking with Auguste, obtaining a Cap and goggles.