In late 1950s, early 60s, at state primary school, I wore a general school uniform, not unlike the one my DGD wears now - gymslip/pinafore dress (with coloured sash denoting house), white shirt, gingham dress in summer. I could tie my tie before secondary school so at some stage I wore a tie?
I don't remember this being particularly odd in our area.
I agree that my area may not be representative of UK or England etc. Personally I do find it surprising that intelligent folk think that because it's their experience, that's the case across the country.