I have a dress in that sort of "whole-body A-line" as well. I wore it last night, and my boyfriend said I looked sexy. Sometimes, it really is about the ease of a garment and not showing everything. As a fellow busty person, I empathize with the button/shirt issue.
I also remember a few years back some women with "normal" bodies (above size 4 American) tried on bathing suits IN their size and were spilling out everywhere--they made videos. They still don't make a lot of clothes for women proportioned differently than Jackie O.
I hope you can get that dress fixed. But the new look looks great, too!