Cycling gear that can be used skiing

Swrve jumper?!

Cycle stuff is fine for light skiing to lunch and dicking around.

Wouldn't be caught dead off piste in deep powder without a proper technical outerlayer, snow skirt, integrated pants, proper gloves and a really good helmet. But then I would never hire skis and definitely NEVER hire boots.

Also if it hits -20 or starts throwing down heavy snow you're going to be fucked wearing a jumper/fleece and pipe gloves or endura gloves. Leather or goretex - or leather and gore tex (ftw)..
Remember it's the mountains, not London.
Like everything else, it depends how far you're pushing yourself and the gear.

This.

Nothing is worse than wearing improper clothing on mountains. The only gear that can cross both activities is possibly spring skiing attire, and base layers. I wear my soft shell for winter riding, but the jacket is absolute fail mid-winter skiing.

Also, layers are important. Thin outer shell that is extremely water proof yet breathable with thermals underneath.