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Wiktionary
topfreedom

n. The freedom to refrain from wearing a top in public, especially for women to appear topless

Wikipedia
Topfreedom

Topfreedom is a cultural and political movement seeking changes in laws to allow women to be topless in public places where men are permitted to be barechested, as a form of gender equality. Specifically, the movement seeks the repeal or overturning of laws which restrict a woman's right not to have her chest covered at all times in public.

In addition, topfreedom advocates seek allowing nursing mothers to openly breastfeed in public, and women to sun bathe topless.