Very true. Aside from that, the only other protective gear I can really suggest is some padded crash shorts. If your skiing an icy park and you take a fall, it will feel like your shredding the skin right off of your butt and hips.
The only other things I can think of are spine protectors or mouth guards. Heard of people using both but I don't personally know anyone wearing either.
"IMO it's more about who you impress than you who know" - Mousseau
I would invest in some crash pads if your skinny or if the snow where you go isn't soft. I'm skinny and ski the east coast, by the end of this year my whole left hip was covered in huge bruises that lasted almost a month after I stopped skiing
for park you should be set with just a helmet, but a lot of pros dont even use that. As far as big mountain, some people wear a mouth guard, body armor/spine protector, and sometimes impact shorts. The full face helmet used to be really popular, but It seems to be fading, probably because Its super uncomfortable, and its pretty uncommon for skiers to get serious face/jaw/teeth injuries anyway