VERB + OVERBUST
underbust
OVERBUST + NOUN
corset
adj
Above the bust.
An overbust corset encloses the torso, extending from just under the arms to the hips.
noun
The circumference of a woman's chest, measured over the breasts.
You can measure your underbust and overbust to get an idea of bra size, but it's still just a guideline.