Fan Casting Limited Wardrobe in Sort by Tropes

The character always wears the same outfit, regardless of the setting or season (this includes backpacks and other accessories). Winter (or at least a Christmas Episode) may sometimes see the addition of a heavy coat, but circumstances will conspire to put the character in a situation where they must shed the coat, at which point it is never seen again. A more likely choice is a hat, scarf, and perhaps mittens, which imply colder weather without obscuring the character's trademark wardrobe. Sometimes, they'll even be shown to have a coat with the exact same color and patterns as whatever is being covered by it.