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I always assumed that was the doctor playing dress up and she wasn’t individual enough to contradict it. Once she came back to the Alpha Quadrant she clearly got some fashion sense
The infamous silver suit was, in-universe, explicitly the Doctor’s design. It was mumble mumble healing suit. Out of universe, it’s obviously an excuse for a horny outfit, but it was never a Borg design.
She actually didn’t keep it very long, switching to her purple outfit, which was slightly less exploitative. That outfit had nothing to do with the Borg, but was a result of her becoming more human.
FWIW, she should have been in a Starfleet uniform, at least after the first few episodes. She wore one well in the episode where she traveled back in time. If the show wanted to keep her unique, her uniform color could have been nonstandard, maybe white on the shoulders, but oh well that ship has sailed.