While there is no specific dress code for the Duomo rooftop itself, visitors are mandated to dress modestly when exploring the Cathedral and its surroundings. It's recommended to cover shoulders and knees, particularly when entering religious sites like the Florence Cathedral. Additionally, comfortable walking shoes are advisable, as the tour involves navigating through narrow and open-air corridors. While there may not be a specific dress code for the rooftop, respecting general modesty guidelines is recommended.