Suggestions Needed

I need a new nightgown. My needs are not that complicated-- a plus-sized tank-style soft cotton or modal knit gpwm, knee-length and preferably without lace or other potentially itchy trimmings. And not cost an arm and a leg. Can I find such a thing? No. I've tried Lane Bryant before-- their 'Dreams & Co' line looks like it would be perfect but they use a cheap grade of fabric is actually very rough and uncomfortable. Anyone have any suggestions? If not, I guess I'll have to resort to sewing.