Good luck with the auction and in your life. I am glad you are doing better.
I've been pondering this. I bought a few dresses in two sizes at NAS because I wasn't sure which would fit. I'm slowly losing weight (good). For now I'm keeping one dress in the smaller size also because I want to be sure I have this dress in a size that works when it gets colder.
I also finally bought replacement Naot sandals to replace the pair I bought as a replacement for my first pair. The newer version doesn't fit me as well, so I am glad I found mine again on Zappos.
The fact that both Zappos and Nordstrom have really good return policy helps, but also, they were nowhere near the deal you are looking at. The shoes are full price; the dress is NAS price.