Sometime during the mid '70s I OBSERVED a classic naked ski. I was in the bar in the lodge at Stevens Pass, WA when we saw someone disrobing about half way up Big Chief chair on Showcase, which leads right down to the lodge. This was in the days when they did not regularly groom it and it was a mogul field.
The guy gave his friend his clothing and began to ski down toward the lodge, doing a very nice job on the bumps, we were impressed. His buddy was folowing but with the clothing grasped in front of him and no poles he was having trouble negotiating the terrain. He finally fell and had a yard sale with his friend's stuff. While he was collecting everything the other guy was stranded, standing in the public area in front of the lodge stark naked. We all got an extremely good laugh at his expense.