The band was a solid 4 inches smaller than I expected from the size. I have ordered other bras from wacoal and never had this problem before, but this was bad enough that I had to return it.
This also wasn't the shape I expected. Probably as part of the sizing issue, the underwire wasn't far enough back underneath my arm and dug in pretty badly. Wacoal usually does a good job with having wide cups, so this was weird.