Figure 1 Over‐bust chest circumference (OBCC) measured with a subject wearing a bra (bold line) and with their breasts hanging without support (dotted line). The measurements are different between the two conditions; the OBCC with the bra on is greater. The OBCC measurement for breasts of different shapes (pert versus ptotic), in different positions (bra on, bra off, breasts lifted or under gravity, standing versus lying) would all change the resultant calculated bra size.