Bra Fence, Idea By John Lee, 66-year-old Farmer, New Zealand

Anatomically, the breasts are composed of soft, glandular tissue, with few support structures, such as connective tissue. Breasts are composed of the mammary glands, which remain relatively constant throughout life, as well as the adipose tissue or fat tissue that surrounds the mammary glands. It is the amount and distribution of adipose tissue and, to a lesser extent, glandular tissue that leads to variations in breast size. In addition, the breasts contain ligaments, although their exact function as related to breast support has not been agreed upon by experts. These ligaments, and the overlying skin (referred to as the dermal brassiere) help determine the resulting breast shape.
As the breasts mature, they fold over the lower attachment to the chest wall (infra-mammary fold), and their lower (inferior) surface lies against the chest wall when vertical. In popular culture, this maturation is referred to as "sagging" or "drooping", although plastic surgeons refer to it as ptosis. The surgical procedure to lift the breast is called mastopexy.
• Bra impact on sagging
Although the exact mechanisms that determine breast shape and size are largely unknown, it is commonly accepted that sagging occurs because a breast's normal anatomical support is inadequate, especially in women with larger breasts. The bra is worn to provide artificial lift, based on the presumption that the breasts cannot support themselves. Health professionals have, however, found no evidence to suggest that wearing a bra for any amount of time slows ptosis of breasts. Bra manufacturers have also stated that bras only affect the shape of breasts while they are being worn.