Have you looked at Mistral?
I wear Mistral dresses for work - primary teacher - because I can't be bothered to decide what to wear each morning, they are comfy, practical, wash like a dream, last for years and are COTTON. Similar kind of idea to the Sea Salt dress but in general a little shorter and slightly bolder prints. A kind of Sea Salt / White Stuff cross, if you will.
Yes, I am probably frumpy. But as someone whose absolutely highest aim in sartorial terms is being un-noticeable (as in, not absolutely shriekingly badly dressesd), I don't care. Especially as the material is wonderfully eczema-kind (one of the reasons I seek mainly to be unnoticeable as an adult is that I spent my entire childhood dressed primarily in bandages as otherwise my eczema bled over everything).