I'm another introvert who enjoys recreating alone. I always have, and I always will. My first outdoor experiences were solo patrols and weekdays off in jobs where I had to work weekends, so I'm both comfortable on my own and trained to be somewhat cautious. Besides, I love the sensation of skiing and the wonder of the mountain, so when I'm on my own I don't tend to stop anywhere but the bottom of the lift unless I'm standing stock still, eyes closed, listening to the silence. So I can be kind of rude and blow by friends who are waiting politely for me.
Of course, there was that one time skiing with Bayla when we both chattered so much that I forgot to get off the lift and caught some air as the chair rounded the lift station.
That was a totally social day, but if I remember right, I don't think we stopped much while skiing even then, just rattled away on catwalks and lifts.
I mostly ski at Alta, and as has been said, it's a pretty friendly place, especially in bad weather when the crowds are gone and the locals come out, so I end up in lots of interesting conversations on the lifts, but I actually discourage invitations to 'ski with,' partly because too many people are faster or better than me, and partly because I get nervous, feel pressured, and ski worse around other people. And because I like getting into a rhythm and the sensation of skiing, once I get going, I tend to rather rudely blow by people who've stopped to wait for me. So although chatting on the lift is a nice break, I'd just as soon leave it at that.
But now that I have skis that beg me to wander off the groomers, I'm more mindful of how quickly everything can go very, very wrong even when you think you're being careful, so it's time to get serious about a whistle. I do have one, but after it failed to hail my buddies who were on a raft that was not very far upwind, I want something really, really loud. After looking at the whistle geargrrl linked I found
this one, which is a little cheaper on Amazon than on the NRS website:
It's 3.25” x 1.76” to the smaller one's 3” x .75” (easier to find and handle with gloves on), the mouthpiece is longer (easier to keep in your mouth without holding it), and it has a slightly lower pitch (audible over both high-frequency ski noises & low engine sounds). NRS says it's one of the loudest available, and for what it's worth, it's audible underwater. I often ski with my zipper at least part way open, so maybe I'll sew short cords with clips attached somewhere around the collar areas of my most-used jackets, maybe under a storm flap at neck height.