I guess it all really depends on the look you're going for. I'm somewhat thin, so I was happy to dump the breast forms the second I hit an A. From there, I just got the little cutlets from the lingerie section to give em a little boost when the outfit called for it. Molded cup bras are great for giving you some shape while everything fills out. Other than that, most of the forms will work just fine until you get to a B. And by the time you're a full B or C, I doubt you'd need them anymore anyway.