I have been looking for a bra that will give my breasts (size 8 forms) a nice, realistic, noticeable jiggle. I have a couple I have talked about in the skiing thread, but I’m always looking for something better, and, it’s fun to shop for bras.
So I went to Sears and found an Amanda Stewart underwire with microfiber cups. The cups seemed to be stretchy enough to work, so I took a 38C (my usual size) and a 38D to the men’s room to try on.

I chose the 38D. I just barely filled the cups and this allowed for more jiggle.

Got to wear it for a couple hours last night and it does allow jiggle, both vertical and horizontal, the net effect is a great feeling! I also find that the increase in cup size produces the corresponding visual effect. I suspect the C cup was squishing my breast some, and also not allowing me to pull available flesh into the cup.
Anyway, I’m real happy with my new bra.
Susann