This is the Rosey Crepe from Made with Love. The material is crepe and was thick enough where I would have been okay without shapewear but I decided to wear some in the end (you do need past the knee shapewear though otherwise the line along your thigh will show since it's fitted throughout the thighs.
In great shape, only worn once and already dry cleaned. It's quite fitted so I can send specific measurements of the dress itself if you'd like.