don't even get me started about tights!!
I love tights, and I wear them all winter. Yeah, under trousers as well. The one time I didn't, figuring UK winters are mild, I got a terrible case of chilblains I won't easily forget... And I wear a hat from October to April approximately. And gloves. :-)
I think many people in England underestimate the weather and have no clue about dressing appropriately. The number of times I have seen half-naked girls shivering in a clammy, December wind in London... They didn't look happy. But the worst I have seen (and I have seen this many times) is parents with a tiny baby, the parents wrapped up, and the baby blue from the cold, no shoes, no socks even, no hat, with a flimsy jacket on (probably because the midwife told them not to "overheat" the child).
Funny though, this was in London - where I live now, on the coast, people seem to understand that a cold wind from the sea coupled with freezing rain call for sturdy boots, hats, and winter coats. I don't feel out of place with my "Polish winter dress sense" here. ;-)