Earlier quoted context omitted.
"free the nipple" could be understood as "let people freely decide what they want to do with their nipples" :)
Are there any societies where individuals decide how to dress rather than broadly following what is acceptable to that society?
Rational dress, free the nipple, cover the nipple, victorian style, SV hoodie culture and all these other fashion/dress movements are about deciding/changing what is broadly acceptable to that society, with both "acceptable" and "broadly" on the table.
Take both OP's comment rational dress and most reform based or freedom based movements' position to be heavy on the "more broad" side. The victorians/etc. on the "more acceptable" side.