I'm glad to know this isn't just in my head. I do think that there was a time in the eighties when adults did wear them, or at least teenagers. But I don't recall seeing them on adults for many years.
DonnaF, I don't know if you can still buy them. I have a pair in my dresser from [mumble] years ago. I have my eyes out for a pair of fun colored tights, like you mentioned. Haven't found one that trips all my happy triggers yet, though.
It sounds like some nude microfishnets might be what the doctor ordered here. I run cold, so I need something to wear on my legs most days if I'm wearing a skirt, and sometimes a person gets really tired of black and gray tights, even with patterns. And sometimes you want some contrast with a dark skirt.