It's not as much of an issue with women as it its with men, but white (and other light colors) can reaaally reallly show everything.....
My husband picked up a pair of really cheap silver shorts once -$5, well when he put them on it was very clear why they were so cheap. They've been relegated to the trainer, not to be worn outside of the basement.
Search for the thread "Why cycling shorts should always be black" for further enlightenment - though I'd say you may not want to do it at work.