Kei has a lot of time to mess with outfit changes after reuniting with the Whitebeard Pirates in Ocean Stars Falling, which results in the hand-me-down jacket meeting a terrible fate: being recut and stitched to make a more haori-like configuration to meet Izo’s expectations.
And of course Kei managed to find belts, equipment pouches, and a second pair of pants. (Her hair keeps getting worse in the salty air.)
She can still look like a hobo when she chooses, but not when Izo is controlling the wardrobe.