Thanks for the update, can't wait to see a WIW with the dots. I love dots, stripes, pretty much anything black and white!
If the zig zag dress comes into stock, I would urge you to get it. I think you will love it. I sure do, and we are shaped and sized somewhat similarly, I think.
You could also try different sizing options, if you are open to trying straight and plus sizes. I flip between both size ranges and in this case it might help you out availability wise.
I ordered a 14W from Nordstrom and a 16W from Macy's (only places it was available, I feel your pain). I ended up keeping the 14W, the 16W was too big in the bust for me.
If you are desperate you could call Austin TX Macy's at Barton Square Mall, I returned the 16W there last week
Honestly I am in love with this dress. It is every bit as flattering as the photos show. I hope to post a WIW soon.
Keep me posted, maybe we can be dress twins soon!