As topwear, you can mix and match to pair with your white jeans but you have to be really alert about your underwear.  This is because some underwear come in poppy colours with seams that might not be the best for you to wear with white jeans. Hence, it’s advisable to go for seamless white underwear that isn’t too flashy.  Also, don’t add too many colours for the sake of colour blocking, it might seem too gaudy. Keep your look simple and go for bold colors.