10 Notorious Star Trek Urban Legends
8. The Uniforms In Generations Are Borrowed From Deep Space Nine
The story behind the costuming department for Star Trek: Generations could easily be an article all its own, but the short version of the story is that brand new uniforms were planned for the movie, before being scrapped entirely for budgetary reasons.
This change of plans created numerous problems. Firstly a brand new line of tie-in figurines that featured the new uniforms had already been created and shipped to stores. There was no way to recall them so they simply had to be released 'wrong'. Secondly, it meant that to fulfill the producer's requirements for "new uniforms" the movie would need to borrow the more jumpsuit-looking style from Deep Space Nine and Voyager.
Literally, too, as it was deemed a waste of money to make all new ones when a selection of them were readily available from the studio.
They gave Sisko's uniform to Riker, O'Brien's to Geordi, Tom Paris's to Picard, and Harry Kim's to Data. The result is several scenes where it's painfully obvious that the crew aren't wearing clothes that fit them, with crew members seemingly using the old TNG uniforms interchangeably.