Teaching Interview Help

Teacher and principal mamas, I need help!! Ive been working at the same school for 13 years and have an interview at a really great local district. I’m not sure what types of questions I should have ready or what kinds of questions they’ll ask me. Also, what should I wear? A friend who is a principal said more professional than regular teaching attire. What does that mean? Slacks and a blazer or a dress suit?

Any advice from someone familiar with the process would be incredibly helpful!