The pattern is from Patrones No. 340 Style 26. I had to take it in a massive amount in the side seams. I only had a little sewing machine with me, so I finished the edges with lingerie elastic. In our silly photoshoot, I forgot to take a photo of the back, but it has a CB seam, which is good for shaping, and slightly cut-away armholes.
The fabric is a viscose elastane from a local fabric store.
I haven't worn this yet as I haven't decided if it is good enough to wear in public or if I should just wear it with the knickers as a sleep set.