I'm contemplating what to wear under my gown, and I would love some recommendations. The dress is an a-line made of organza and satin so it isn't as forgiving as a ballgown or a dress made of heavier material. I was planning on having cups sewn into my dress with high-waisted shapewear of some sort....or do I go with a bustier? Should I go with Spanx or is there a better (or more affordable) brand? Any input is appreciated!