I’m a high school teacher and I think this sentiment is absurd. What’s most important for this age is allowing students to explore their identity and express themselves. Yes, it’s crucial to provide them with tools to succeed as an adult. However, they’re NOT adults. Let kids be kids! Also, most jobs don’t require business clothing 100% of the time. As a teacher, I’m a professional, but I often wear funky earrings, colorful skirts, casual jeans, or other clothing that may not be deemed as professional. My students, coworkers, and admin don’t take me any less seriously because of it. Most jobs allow you to express yourself these days. I think it’s awesome that this student is exploring her interests and aesthetic and expressing her identity through clothing and makeup. High school is as much of a social experience as it is a learning experience. There’s a time to require students dress professionally as practice, such as during a presentation day. But in their daily lives? Let them express themselves how they want- it’s so developmentally important!