Proposed Canon
 Real World References
Sansabelt is a clothing company that specializes in pants (North American usage, not UK), trousers and slacks.
"Sans a belt" also means "without a belt", and "pants" can also be a verb meaning "to suddenly pull down someone's pants by surprise." The two things together may refer to Prince Ossomer sneak-attacking Haggar suddenly ("pantsing" them, perhaps), and indicating the city's vulnerability ("sans a belt", vulnerable to pantsing).