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Because outfit change is too taxing for an artist hahahaha. Soooo yeah kinda sympathize with ze artist and maybe he/she wants the character to stay with that outfit to make it more look like a default. Then when the time comes it will change with a bang!! Hahaha

lejxkajajhah maybe a suit would be good for some scenes yk,, he'd look really cool

Lol yeah a suit is good then retaining the slippers will do the trick. Hahaha he might look like a mafia boss