I had two identical £25 pairs from next which have lasted a good year but they’ve now lost their elastic at the waist... they fit like leggings on the leg, thick material with a seam down the front but have a zip and poppers at the waist to prove they are trousers and therefore conform to my work dress code of no leggings
they are warm, comfy, and fit inside ankle boots. Next don’t do this style anymore and I can’t see anything similar!