https://drdongraham.com/breast/mastopexy/

It is natural with aging, pregnancy, or weight loss, to lose elasticity in the skin, and have saggy breasts with the nipples pointing downwards.

Breast lift, or mastopexy, involves removing excess skin and tightening it, and lifting the nipple into a higher position.  This leaves a more lifted and pleasing breast shape.

Sometimes this is combined with an implant, if more volume in the upper part of the breast is desired.