I second Nordstrom. They will tailor your clothes for you, and NOTHING looks better than custom-tailoring. (except, perhaps, haute couture. But who can afford that.) I have one great pair of nice slacks that I need to take in to have them altered again. Happy to say that it's "in" and not "out".
Long Elegant Legs runs super long in the leg, and I think they do have some plus sizes. I'm about a size 20 right now and I've only got 33" inseams. My height is in my torso. So everything "tall pants" I get I usually have to hem, but it takes like 5 minutes on my sewing machine, so no biggie. I ordered leggings from them (XL fits me) and when I put them on, the hem went all the way to my toes!!! It was pretty funny.....
Sizes are all over the place, though, and I agree about checking the sizing charts. Above mentioned slacks are an 18 and they are huge. Can't wear my 18 shorts from Lane Bryant yet. What is up with that? Grr.