This dress by Ella Moss is literally red hot.
The Sabrina dress is a 50% pima cotton, 50% modal (a variety of rayon) blend with a gentle scoop at the neck and adorable ruffle detail on the sides of the hem. I love the little bit of ruching across the front -- with the right "accessories," you could wear the dress without a restrictive bra. The dress comes with a braided moleskin belt, but to be quite honest, I don't love it. I'd rather throw on a slightly wider belt.
It is available in both red and black for $185 at Shopbop.