Quote from: Deborah on July 23, 2016, 10:14:27 AM
So I think the only thing that does work for real is trial and error until one finds a band and cup that is snug but not tight and that is comfortable.
Yes, that seems to be the way it is. Plus it's not just the band and cup sizes but also the style of the bra – for me, a full cup 36B has a bit of empty space in the cups and chafes while a demi-cup 36D fits wonderfully. As long as it's made by the right manufacturer, of course...
The things I've had to keep in mind are 1) the rib cage measure, 2) the circumference of the base of my breasts, and 3) the bust measurement. Of these, #1 determines the band size, #2 the cup size, and after that #3 has an effect on the required cut of the bra. Using #3 for cup size (as the standard directions go) can lead to the grapefruit-in-thimble effect (that is, the breast will not fit in the cup, leaving it empty).
Finding a bra that fits is pretty much like finding any other clothes that fit: the sizes give some indication but you really need to try it on.