Though in our times the fashion is to leave the pallu (the loose end of the sari) largely unsecured,  historically there were several ways of securing or draping the pallu of a nivi sari.

In the 1930s-1940s when the nivi style was fairly new amongst the many modes of doing so were the kinds shown in these paper dolls.

From the left: 1) the loosely draped over the shoulder style (more common in South India) – sometimes the pallu would be loosely secured at the waist much like for a nine yard sari 2) the pinned to the shoulder with a brooch and then draped over the head style, more common in Bengal and Western India 3) similar to style 1 but with possibly a brooch at the shoulder and something like a belt – though this style doesn’t always require the drape over the shoulder and 4) the loose end of the sari tucked in at the waist (common in vintage Tamil photographs and also a bit of a 1950s thing)