What is appropriate to wear in the classroom?

I start my field experience soon and I will be in a middle school classroom. I’m 19 years old so I have a ton of cute v-neck lower cut sweaters. Are these appropriate to wear in a classroom setting?

Any tips on how to dress up a blouse? I have tons of cute shoes and just black/grey/pinstripe pants but I’m not exactly sure what to wear for tops. I have tons of plain colored long sleve shirts also.

I just finished my field experience at a middle school. The first day I tried to go very conservative the first day so I wore black dress pants, black heels, and a long sleeve button up. Don’t try to go all out the first day. Go and observe one day and see how the other teachers dress first. I would just wear a simple long sleeve with an undershirt underneath. Just make sure it’s modest.