What makes some breasts pendulous?
The fibrous ligaments which support the breasts stretch with pregnancy and also under the influence of gravity. Once attenuated they do not regain their pristine configuration. One reason offered for using a properly fitted brassiere is to minimize the stretching of these breast supportive tissues. This seems obvious, from observations of breast contour in societies where brassieres are unknown. Pendulous breasts are normal. The objection to them, at this point in our culture, is an aesthetic one based on contemporary standards.