When I was a size 20 I lived in primark jeans, people always think primark is
crappy quality but I have pairs of primark jeans in my wardrobe from 8 years ago that are fine (albeit now too big for me
). And for the price you can’t go wrong really. If you have a YOURS or a ROMAN store near you I’ve had jeans from there which fit well and have lasted.
I really feel your pain though as I find jeans so hard to wear and so varied in sizing - at the moment despite being a size 14 I have jeans in a size 14, 16 and 18 all from different stores, all of which fit me in different ways, e.g. one size 18 pair is baggy on the arse but another one fits me quite snugly on the stomach, but another is a size 14 and fits perfectly, but another one is a 16, fits fine on my stomach and legs but gives me a cameltoe
and on and on and on.
To echo a few PPs jeggings can be pretty comfortable as can leggings but in my experience they never stay up on my stomach and I’m constantly having to jiggle and pull them up.