[littl3chocobo]

underwire is a metal 'rib' that is in some bras to reshape a breast to give it a pleasant shape. it is considered a 'support' because it keeps the breast up even when moving and while it actually damages breasts over time there is still a contingency that claims it does them well simply because while in use it does keep the shape(though i really dont get why since people who love breasts are fairly generous with what sorts of breasts are 'acceptable' in terms of size and shape)

i do know that you have to get it in the right size though or it just digs into your body and i did wear a padded bra a few years back for a halloween thing and while i deribbed it the thing was super uncomfortable on the ribs