Some pics and more measurements for you:
Bra cup NOTE: This is WITH padding. Add 1/2" to 1" without padding.
Widest side-to-side: 7 1/2"
Widest top-to-bottom: 6"
Wearing black undies here...you can't really tell, huh?
Waist belt is configurable however you like...attach it to the bra or just add hooks to attach it around the waist.
This fabric is pretty stretchy, so it is very accommodating.
Joulya :)