I've been reppin a white jacket/pants for three years now and its not as bad as you would think. However, you definitely do have to wash them more often than you would a darker jacket or pants, but I wouldn't make a different choice based on how dirty it gets. You are on snow most of the time so it really won't be a hassle. If you do a lot of urban skiing where snow might not be as consistent or even existent then I would probably recommend a darker colored jacket or suit. But for the normal mountain its fine.
or smoke weed and then jerk off. that makes it 100x better. you know you're high as fuck when simply getting a boner feels like the hand of athena has come down and is gently caressing your cock in a cloud of majesty and marshmallows