I feel your pain, OP.
Next does a few decent Tall basics (jeggings, joggers, vests) but most of their stuff is hideous.
LTS is ghastly. I check the website in hope every season, but it’s all so frumpy!
ASOS - occasionally have success with dresses, but their tall jeans are a terrible fit and go all baggy at the knee, and a lot of it I too skimpy/young for me.
I have success with Hobbs and occasionally Boden for work dresses (Boden does some styles in Long, Hobbs seem to cut a lot of their dresses in a midi length which is knee length on me).
H&M and New Look do decent longer length skinny jeans, but they’re very skinny. I had great success with Levi Curve jeans, which cane in a 34 & 36 inch leg, but they’ve been discontinued.
It’s slim pickings out there!