For work, I find Hobbs shift dresses sit quite well on me - the waistline skims and they're cut so they finish on the knee on (6 foot) me. I wear them with a blazer or a cardie. I got some blazers from Zalando tall, and a couple of them are OK, though one is a nylon job that gives me static hair!
Mint velvet are OK for body length, but sleeves are a bit skimpy.
I can't stand the materials in New Look, my hot flushes need a lot more cotton involved than they provide.
LTS are hopeless - frumpy, and the stuff I have bought from there has not worn well. They did some cracking jeans a couple of years back, but then discontinued them.
I've embraced the ankle skimmer look with some Reiss trousers recently - their slim fit trousers look like quite an elegant 7/8 length on me. Their tops are quite a good length, but I have struggled to style them.
Gap has some longer line stuff, and again has the odd nugget of a great jean in a 35 inch leg. But it's hit and miss. I've scored big in their outlet shop - nobody else wants the stuff that fits me!
Good luck, OP, I feel your pain and thanks for starting the thread - a few good ideas here.