I considered buying one, then making one, then forgetting the whole idea. Then I decided to check my closet and see if I already had something that would work (sadly this happens to me a lot). It turned out I DID have something, this chartreuse kimono dress that I made a gazillion years ago, back when I first started sewing.
The biggest flaw in this garment is the size, it's too big. But the fabric is nice (a cotton/spandex knit) and the style lines are interesting. In other words, it could be hacked up and made new. I especially like the crossover front (yay for nursing access!) and the kimono sleeves. Plus, cotton. I went ahead and cut off the skirt portion, which allowed me to redo the front wrap. I basically just wore it and fiddled with it and basted it until I had it where I wanted it.
You can see the chalk marks under the bust.
Then I reattached the skirt under the bust. This shortened the torso and moved the waistline up, but that was what I wanted. I need the skirt portion to skim over my middle rather than hitting at my natural waist. Luckily the skirt was long enough. The skirt was apparently just a rectangle the width of the fabric, because it only had a center back seam. I kept the back with a 1:1 ratio and then gathered the front. With the gathering I can actually wear this now! I did add elastic under the bust between the princess seams for extra stability. This isn't intended to replace a bra or anything, I plan to wear a nursing bra underneath, so it's not a full shelf bra.
I also tightened up the back neckline as some of the previous gathering there had come undone. Overall, not too shabby for an afternoon of work. Maybe I'll even hem the sleeves this time! (No, I won't...I ran out of my chartreuse thread.)