I had two identical pairs of M&S work trousers that I bought 18 years ago. Absolute classic basics. I've just thrown them out but cant find anything in M&S which looks as nice or makes me feel as good. Their black trousers all seem to have billowing crotches.
As a fat woman, I want well-shaped (I do have a waist and it is nice to break up my shape rather than try and make me look like a potato), nicely hanging clothes with sleeves.
M&S plus range are offering me sleeveless sacks and larger versions of the special trousers linked to in the OP. They are worse than Evans, which takes effort and determination when Evans have been successfully disappointing fat women for decades.