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Poindexter.short answer is dont
GuesstimateIn this day and age you can get other materials which do an equal job of keeping water out, while improving in all the areas which waxed canvas falls short, such as maintenance and bulk.
do you have a waxed canvas jacket that you want to wear skiing from time to time? sure, go for it, its not like half this site doesn't wear hooides and other ramdom crap up on the mountain from time to time.
do you want to buy a waxed canvas jacket to be your go to ski gear? Thats probably not the best idea, some other technical fabric will treat you well.