OK, I am going to hold my hand up and admit to owning the red Seasalt dress. And I really like it!
It was a present - Seasalt wasn't really on my radar - but I'm impressed by the quality of the workmanship and the material. And the fact that it's cotton with a cotton lining.
I'm wearing it right now with bare legs (yay! sun!), dark denim wedges and, I admit, a fitted cropped blue cardy. I had a denim jacket on earlier when I went out, which works very well with it.
Is it frumpy IMO? Dunno, and don't really care. It just about covers my knees - I'm 5'10" and pretty skinny. The flared skirt balances my broad shoulders so....win win, I think.