I meet up with a group of old friends once every two weeks, we go to a local coffee shop or occasionally a day out, etc.
I have known most of them for over 30 years, although I am the youngest by about 10 yrs.
Recently I have begun to notice comments, not all at once, but over time.
I am a reasonably confident person so never thought much of it before, but maybe i am going through a deep phase 
I wear fairly minimal stuff, like a Toast donegal jumper with H&M jeans, docs, or trainers.
If dresses maybe a dark cord or cotton semi fitted thing.
My coats are long plain wool or little Barbour jackets.
My hair is longish, dark blonde and not dyed. I wear minimal makeup and am 5'5 and slim. There's nothing about me that jumps out. I feel just average, really.
My friends are similar but wear more patterned clothes, or floaty things, i get that we shop differently, but who cares? I can't see a massive difference. An example of the comments might be "That is a strange jumper, it's a nice colour though!"
Or "You have been wearing that necklace for years, don't you like jewellery?"
Or "Have you thought about having highlights it might pep you up?"
Sometimes I mention a new perfume and have been told they can't smell it.
I don't think they're 'negging' me or anything wild, but I am beginning to notice it nonetheless.
No one has ever told me I look decent, or asked after a thing, like you hear on MN so often! I presumed I was just nondescript, but considering they never say such things to each other, I wonder what to make of this?