In Kerala, the Mulakkaram was imposed on lower castes. According to the Mulakkaram tax rules, lower caste Hindu women couldn’t cover the upper part of their body. The women were just allowed to cover the lower part of the body with a lungi like cloth.
At appropriate intervals the upper caste Hindu men would come to check the size of the breasts of lower caste women and tax them accordingly.
When Tipu Sultan captured these areas of Kerala, he abolished this practice, supplying the lower caste women with clothes from Mysore government’s Bait-ul-Maal (treasury).(May Allah reward him for this.)
Source: Taken from an article in The Deccan Herald and the life of Nangeli.
https://www.deccanchronicle.com/opinion/op-ed/040819/tiger-of-mysore-saviour-or-savage.html
Also see: The village-legend of Nangeli is about an Ezhava woman who lived in the early 19th century at Cherthala in the erstwhile princely state of Travancore in India and supposedly, cut off her breasts in an effort to protest against a caste-based “breast tax”. (Wikipedia)
Saheehus-Seerah 