I actually think white jeans can be cute, but you really have to find the perfect pair for your specific shape, as with any other piece of clothing! There's no universal rule. Anyway, cute layering here, I like the colors!
No one needs some white jeans. Sorry, but they are the least flattering of anything other than white sweat pants, or white leggings. White anything on the bottom shows all flaws, draws all eyes, and shows all dirt. Why would you want that?