By "incidental people" I mean those we knew in passing in some way rather than people who had a more central role in our lives.
Are there any of these people that you often think or wonder about?
For me, there was a girl I went to college in the early-00s with whose shoes (kitten heels or ballet pumps), belt (one of those chunky ones worn on the hip with a bit hanging down one leg), handbag (tiny shoulder bag), and eye shadow (right up to the eyebrows) were always a perfectly matching colour.
I think about her every time I'm shopping for new clothes and wonder what her style is like nowadays. I don't think I ever spoke to her and I can't remember her name.
There was also a boy who used to live up the road from me who used to lie about everything. I often wonder what he's like now and whether he grew out of the lying. I've tried finding him on social media but he had a really common name and haven't been able to do so.