Are none of you chilly mortals? I wear tights nearly all the time, except high summer because my feet get cold, even if I am wearing trousers or leggings. In winter I wear thermal socks as well.
I need a 31 inch leg for trousers and, generally, never have a problem finding tights to fit that leg length. For fine tights I buy medium in Waitrose when I do my shopping. Thicker winter tights, I just go online. There are hundreds of companies selling them in a wide range of colours.
One exception, my usual bugbear, M&S . In the past all their tights have been the crutch at knee variety.