I've been wrapping my foot before putting it in a boot when I go skiing since I broke my foot. Not exactly the ankle but you could benefit from it as well. But as the above posters said, a brace would probably be better. I'm just not sure how you get a braced foot into a ski boot.
you could use those "tight socks" type of things which are used to support ankles or these 15 inch straps that you wrap under and behind your ankles and then together which also support it a little. that way you will probably still be able to fit into a ski boot.
in all seriousness, i read that 3 times, 1st time i thought what the fuck is he on about, read it again and thought, this fuckbag has to be kidding, read it once more and decided calling you a fuckbag wasnt good enough - sick-as-aids