What things have disappeared in society, and you did not notice until much later?
So when I was young in every shopping street you would see old women wearing coloured polyester macs and headscarves. And then one day I suddenly realised that I had not seen a woman wearing this kind of clothing for a long time.
The same with plastic rainhoods. You used to see these for sale in newsagents, and elderly women would wear them when caught unaware by the rain. Again disappeared.