Bijou, what a lovely lyrical post, taking us down your memories. So many resonated with me, including the plaid shirt / skinny jeans connotations!
I also love it, and remember a dress as a 3/4 year old (like Jenni described, with a sort of singlet top), a blue tartan skirt with wide elastic waistband in 1989, Green tartan trouser in around 1988, a red tartan skirt I made myself and wore to death at uni, and a red tartan baby doll mini dress tunic that is still in my clothing archive box, and I wore a bit in my early days on YLF.
Now I have a grey tartan jumpsuit, and a red tartan shirtdress/ tunic (that I wore at our in-person meet up). And red gingham dress - the same as Angie has/had Since I have quite a small wardrobe and most of it is plain, that is a reasonably high proportion of what is patterned.
I had a lovely blue tartan chiffon blouse a few years ago that sadly wasn't durable and wore out. And I'm very drawn to gingham and have been looking for just the right one (I don't like much shirring on me and the two seem to go together a lot).