I was going to suggest Land's End, but I see you have them covered already. Their clothes fit me well - especially their bathing suits. As a surfer, I have to have a wide variety of suits that won't ride up, fall down, or make me look awful. AND I'm slightly plus-sized. So it's hard to find stuff that's not miracle-suit thick or $150. They've kept me supplied for a LONG time.
Oh, and their swimsuit prices have gone WAY up in the past two years, but I shop the sales and really keep an eye out for bargains. I got one of the nicer suits for about $30 last winter. I buy them in the winter .
It's not a particular brand, necessarily, but I find that the daily deal's site Zulily frequently (as in every other day) features plus-size stuff. I'm not plus size myself, so don't click into that section, but the models seem to be "real sized."
Plus there are tons of other things on there. It's a "mom and baby" site but I don't have kids and still check in every day at 10 to see what's on sale! They frequently feature Kerritts and Ariat for some reason, and I've gotten some great deals on breeches.
You do have to sign up to get into the site, but I promise it's worth it!