R. Star wrote:
. . .As for Voyager, they kept the old uniforms since they were separated from the Federation. Though by they were aware of the uniform change by Message in a Bottle and definitely by Pathfinder.
They couldn't afford replicator rations to make new uniforms because they needed to take advantage of the incompatible power source to the holodeck.
Dr. Howard, Dr. Fine, Dr. Howard: For duty and humanity! --Men in Black (1934)