Because by the time Voyager launched the DSN style unifrom was being phased in.
They had the early DS9 uniforms and stayed with them for the entire series.
In-universe, commanding officers seem to have the authority to decide which uniforms the crew will wear. Janeway liked the jumpsuits, therefore the jumpsuits were the preferred uniform for all.
In DS9, when Sisko becomes temporary head of Starfleet Security on Earth, he wears the TNG-era uniform. It seems to be a more formal uniform, between the dress uniform and the "fatigues" of DS9. Would make sense for Picard to prefer a more formal uniform for his starship.
starfleet had already made the transition to the new uniforms when Voyager put to space.... either that or Bob Blackman decided on a larger wardrobe....![]()
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