Because of course Luna would adopt the Hat.
Yeah, basically, Didymus, you've all but mentioned pieces of cake now. SUSPENSE.
(There is a vague attempt at hidden Bowie-face, as are present all over the Labyrinth in the movie, but I can't quite claim I pulled that effect off quite as well.)
This is a work of fanart and solely intended for shits and giggles. Not mine, not making money from it.
Sarah, Sir Didymus&Ambrosius, the Wise Man and his Hat, glittery sets [Labyrinth] (c) Lucas, Froud, Henson; Connelly&Bowie
Mystic [The Dark Crystal] (c) Jim Henson and Brian Froud
Luna Lovegood [Harry Potter] (c) JKRowling and WB
Based on the original Roommates comic by *AsheRhyder