Dreams about being in a former school often reflect a desire to revisit past experiences or lessons learned. This setting might indicate a need to reflect on personal growth or unresolved issues from that time in your life.
Wearing a royal robe symbolizes a sense of authority, power, or recognition. However, the fact that you noticed it was on you incorrectly suggests feelings of inadequacy or discomfort with a role or responsibility you're currently assuming. The act of changing it without pulling it up could indicate a desire to correct a situation in your life without completely abandoning your current path.
This dream might be urging you to examine areas in your life where you feel you might not be presenting your true self or where you might be struggling with confidence. Consider what aspects of your life currently feel out of alignment, and think about how you can adjust them while still maintaining your position or responsibilities. It could be a good time to seek clarity on your goals and how you wish to be perceived by others.