Simply Be is a UK plus size line. They started selling in the US a few years ago. I haven't ordered anything from them yet because when the first started selling, shipping and returns were high and took longer than ordering from a US company. I have heard that is better now but I haven't really looked into it. The Nordstom link is new within the past year. Evans from the UK and City Chic from Australia also popped up at the same time with Nordies.
Like many other things, there is a range of quality. Their clothes appear on the plus size fashion bloggers fairly regularly. They have a number of exclusive lines and if I wore dresses, Anna Sholtz would be pretty high on my list.
With the free shipping and runway videos, its hard for me to order from any other international company other than ASOS Curve. There is always a ton of stuff I want though.
http://www.simplybe.com/
Added:
** I just checked the Nordies website to see what they were carrying but I couldn't find anything on the website from Simply Be. I must have been thinking of their selling Evans in the US.