Buttock cleavage

When faced with indecency issues back in the 1930s, W. G. Cassidy explained in an essay titled "Private Parts: A judicial view" that exposure of a buttock cleavage may come under "other private parts" in Australian law, though indecency generally involves exposure of the genital area.

[2][3] The Cincinnati Enquirer called it the "new cleavage", and expressed views that "It's virtually impossible to find jeans to cover your hipbone".

[5] Jeffreys (2005) identified British designer Alexander McQueen as the originator of buttock cleavage-revealing jeans, known as the "bumster".

[6] In 2013, Cosmopolitan said that ultra-short miniskirts and shorts exposing the lower buttocks had gained popularity among women, influenced by celebrities such as Lady Gaga.

The terms are based on the popular impression that work in these professions frequently involves bending over in locations where bystanders are observing from the rear.