Lets face it, she runs around with a cricket Bat, of course a Cricket Uniform skin would be in Order!
The female uniforms are also a decent fit for her, Considering the leg guards “toughing” up for running about, and the batter helmet and or in combination with a cap to go with her ever so… lovely personality and obsession with proxing your socks.
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The gloves could be a slightly fancy edition as well, not to mention the fact Proxy already wears a cap, with the wielding mask over it, then perhaps replace welding mask with a sports helmet protection grid thingy “resting” on her head just like the mast does.