MIDRIFF

In the human body, the 'midriff' is the section of the body between the chest and the waist, i.e. the diaphragm area. Its main outside anatomical feature is the navel.
This body area is exposed when wearing a crop top, bikini, sari/choli etc.
Exposure of the midriff is socially discouraged or even banned in certain cultures. In Western cultures and others, especially during the late 1990s, it became fashionable for women to expose the midriff.
It is a word of very old origin in the English language, known before 1000 AD. It is written in Middle English as "mydryf" and Old English as "midhrif". The old word "hrif" literally meant belly. The word was essentially obsolete after the 18th century however the word was revived in the middle of the 20th century in the world of fashion, partly to avoid use of the word "belly" which many women consider undesirable in reference to their bodies as it has connotations of obesity.