I made the size medium, which is the same size I made my first Washi dress in. (I tried that one on near the end of my pregnancy, to make sure the bodice still fit, and it did - then. Now the bodice is *very* snug, but it works.) I made it sleeveless, and trimmed a bit off the straps. I more or less followed this tutorial for a button-front Washi (the blog seems to no longer be on the internet, but the text at least is still available on the web archive). It is lined in the bodice only, and I made three parallel casings for narrow elastic at the back bodice, instead of shirring. The dress is a lovely soft Alison Glass double gauze, and the lining is the same blue voile I used to line my first Washi. I decided on a whim to topstitch with hot pink thread. The topstitching isn't super visible in the pictures, or from far away, but up close the pink topstitching in combination with the pink Kam snaps really make the dress.
If I were to make another nursing Washi, I think I would size up in the bodice and raise the neckline a little bit, since nursing bras tend to have full coverage and sometimes I worry about the edge of my bra peeking out from the neckline. But on the whole, this has been a perfect dress to wear to church or just out of the house this summer, and I think with a cardigan, wool tights, and a slip it will be cozy for fall and winter, too!