In Swiss, women have been allowed to swim in a lake without a bra.
Independent: Women can now swim topless in Lake Geneva as Swiss authorities
Before the new legislation was established, topless women were subjected to the fine up to 70 Swiss Francs. Some women claimed this rule was sexism, as well as inconsistent with that sunbathes topless was permitted.
The authority amended the rule which had been set since 1929 by Geneva's regional council. However, topless swimming in a pool is still illegal.
It is doubtful many women will enjoy topless swimming thanks to this amendment. Some men will rather oppose to the relaxation of the law, perhaps.
Sex discrimination should be banned. But I am not sure if prohibiting bare-breast of women is discriminating.