hiya you get a pair of tights and fill each leg with the amount of rice in grams as the cc implant size, so for me i put 460grams of rice in each leg for 460cc.
cut the tights down and tie the ends and then shape the rice so its rounder and it gives you a rough idea on size when in a sports bra, i think there only a rough guide tho and maybe slightly bigger then the actual implants x