"Colorado asks the starting pitcher to determine which jersey the club will wear each game. … It might not be the biggest decision the starter makes, but it sure is complicated. …. "It seems we’ve got about 12 different jerseys, so we can have a different look every night," right-hander Jamey Wright said. Actually, the Rockies have five jerseys — six if you count a slight variation that was used in one game. That adds up to more looks than the number of different pitches that any of the starters possesses.
I would think most of the Rockies would choose to wear the uniform of say, the Cardinals if they could.