Many bra companies like to pretend that sub-28 sizes do not exist. However, many women really do wear bra bands sized 20, 22, 24, and 26. Some even smaller. Keep in mind, the material will stretch. Unfortunately, because the bra companies like to pretend that smaller bands do not exist since it is more profitable to them, it is almost impossible to find those sizes. A rixie clip may work to tighten the band. Your best bets are to get a bra altered, which may not work because of the wires and how they might then dig in to your body. If you have a bra tailored, get a bra that is up one band size and down two cup sizes. As band and cups are proportionate to one another, a cup on a larger band will have larger wires. This is why you will want the smaller cups, for the smaller wires. *Cup sizes above D tend to vary significantly between manufacturers, so check with the retailer or look for customer reviews before you buy online.