Long johns

Leggings as underwear is the modern equivalent. I once knitted two pairs of long knickers in double knitting wool for a cold winter in the north of Scotland. I still belief in keeping my lower body warm.

I can remember everything being flannelette and winceyette during autumn and winter months, from bed linen to the lining of my knickers---in the 50's, " to keep the kidneys warm ".
Dad wore long-johns and mum had large silk bloomers ( she was a big girl ) large briefs in the summer. I don't remember having any fancy underwear ? Unless a vest with a bit of lace around it counts
All knickers were as someone described, Harvest Festivals.

I used to buy my H thermal long johns which he wore over his normal “undercrackers” and under his trousers for golf in the winter.
I can never remember anything long for women.
I was too old and staid probably by the time the bright young things were wearing them.

My late Canadian friend (British Columbia) told me cowboys at rodeos wear womens' nylon tights under their breeches. In my opinion this demonstrates lateral thinking.

I remember those red pantaloons, made is some stretchy man-made fibre with black lace around the bottom. I wore them under my school uniform around 1964/65. They were a wonderful warming layer to cover the gap between stocking-tops and knickers as I waited for the school bus in the vicious easterly wind that always seemed to be blowing.

I wore a liberty vest in winter as a kid. Long johns from Damart under my trousers in winter when I worked for the Police as a young women. I would not have got through winters in Toxteth without them.