Umbilicus
The umbilicus, also called the navel, is essentially a scar representing the former attachment of the umbilical cord in the fetus. The colloquial term for navel is belly button. It can form a depression, a type of umbilicus commonly referred to as an innie, or a protrusion, referred to as an outie. The underlying abdominal muscle layer also presents a concavity; its thinness at this point contributes to a relative structural weakness that makes it susceptible to hernia.One fashion is clothing that leaves part of the lower abdomen with the belly button bare. It is much more common for women than for men. Displaying a bare navel has been a taboo in Western society, as the depression of the navel is taken to be an erotic visual echo. Thus, fashions of display have usually been confined to women and have been perceived as part of liberation and youth movements.
A common though fortunately harmless problem among clothes wearers is the collection of belly button fluff in the navel. This has, surprisingly enough, been the subject of serious scientific research.
In India saree is the most common dressing of women. Saree is draped is such way that belly is always bared. Now a days fassion of wearing saree below navel has become very common.