There's no single, global "Ministry of Education" with a universal stance on school uniforms. The policy on school uniforms varies drastically from country to country, and even within countries, from state to state or region to region. Some ministries of education might mandate uniforms, others might encourage them, and still others might allow schools to decide independently.
To find out a specific ministry of education's stance, you need to specify the country and possibly the state/province/region you're interested in. Then, you can search the ministry's website for information on school policies, dress codes, or education regulations.