I mean people look so rumpled and scruffy. It affects me in that I have to look at it
Your peace of mind shouldn't be affected by something so trivial as other people's clothes.
If I turn up to the school run in heels, tights, a dress and an up-do, it’s too much and I become the weirdo
Then you are out-of-step with where you live. Either accept that and join them, or dress how you want but accept that no-one else is interested in doing likewise, or move to where you'd feel most comfortable.
By period it’s anything really up to the 50s really. Clothes became factory made and cheaper so that rather than having one black dress, two normal dresses and a Sunday best or two, the nation’s wardrobes are now bursting with poorly-made, ill-fitting, grey, shapeless, bobbled, pyjama-looking clothes
The past is long gone and I don't think it's coming back. The good news is YOU can dress however you want.