One of the staple Franco-Belgian comics is Spirou, which is about a reporter/adventurer who for some reason wears a porter uniform.

The reason is that the first author of the comic made him a bellhop for a hotel. Then the second author, who moved from single-page gags to more serious adventure albums, changed the hotel into a newspaper and promoted the bellhop to a reporter, following the Tintin formula… but didn’t change how he was clad. That eventually changed much later, after many other author changes.