Barcelona turned down a kit idea from Nike that featured them in a glorious white shirt with a couple of red stripes, according to Mundo Deportivo. The idea was turned down by the higher ups at Barcelona, likely due to the fact that Real Madrid usually feature a white home kit.
Fans of Barcelona’s history will remember that of course Barcelona rocked a combination of white shirts and shorts back in the day. Here’s a thread that shows some of the history behind Barcelona in white.
Here's a nice gallery with a whole bunch of images of Barça's historic white kits from when they were founded right up to the 70s https://t.