Wiktionary
n. 1 A notional line around a woman's bust 2 The circumference of this line
Wikipedia
A bustline is an arbitrary line encircling the fullest part of the bust or body circumference at the bust. It is a body measurement which measures the circumference of a woman's torso at the level of the breasts. It is measured by keeping a measuring tape horizontal and wrapping it around the body so that it goes over the nipples and under the arms.
In relation to a woman's garment, the bustline is the outline or shape of a woman's bust, or the part of the garment which covers the breasts, such as a dress with a fitted bustline. The bustline is an important measure in women's clothing sizes.
Usage examples of "bustline".
She was tall, about five foot eight, slender, with a pretty decent bustline and narrow hips.
I am looking for better ways to cure warts without surgery, to clear up acne, to banish horrid age spots, prevent ingrown toenails, athlete's foot, and dandruff, to straighten hair and curl hair, to give nose jobs, to improve bustlines and bottoms and such.