top bust measurement; full-bust measurement; overbust measurement
Clothing and lingerie term for the circumference around the fullest part of the bust, often used alongside アンダーバスト (underbust).
See also: アンダーバスト
When choosing a bra, the difference between the top bust and underbust measurements is important.
Variant with interpunct; less common in running text.
Loanword from English 'top bust'.