The bomber jacket costume consists of a bomber jacket and bomber cap which are rewards from the Enlightened Journey quest. It can be stored in the Armour case of the costume room in a player-owned house. If lost, the cap and jacket can be obtained for free from Auguste.
Gnome goggles from the Gnome Restaurant activity can be combined with the Bomber cap by talking with Auguste. Players can separate them by choosing the "Split" option when right-clicking the cap and goggles. The costume is often worn with a gnome scarf.