Fit ever so slightly large, but I'm between cup sizes, so this will not be a common problem.
Honestly the hardest part was untangling the lacing and pouch once I had put it on. It was tight like a corset should be, but strangely comfortable. I've been doing cabaret style shows since 2014 and this was the most comfortable corset I've ever worn. (Anyone who says it was uncomfortable isn't tying it on themselves correctly.)
The pouch isn't big enough for your phone, (maybe one of those tiny 3rd gen iPhones) but it is big enough for credit cards and my cars flip key. But I'm not going to remove a star for that since it's a period piece.