As of my knowledge cutoff in September 2021, Mumbai, like many other cities in India, has a diverse and cosmopolitan culture, and people have varying fashion choices and dress styles. There is no specific dress code mandated by law for girls or women in Mumbai.

However, it is important to note that India is a culturally diverse country, and societal norms and expectations regarding dress can vary based on factors such as religion, regional traditions, and personal preferences. In general, many women in Mumbai choose to dress in modern and westernized clothing, such as jeans, skirts, dresses, and tops. Traditional Indian attire, such as sarees and salwar kameez, is also commonly worn, especially for special occasions or religious events.