Studying Abroad - Have some questions!

Hello! I am studying abroad in Amsterdam in May (yes, very soon!) and was wondering about the clothing style? I was trying to look up ideas but a lot of it was from people who were visiting, so I don’t know if that’s accurate.

While studying abroad, I am going to be teaching in a classroom. I was curious about the “professional” looking outfits as well. I can’t pack too much so I don’t want to bring anything I can’t wear, so I was curious as to what was appropriate for teaching. Like would a romper (long pants) be appropriate? Are tank-top straps okay? Is there a rule for any clothing-related things, especially when teaching?

Thank you! Any other advice about ANYTHING is welcome and appreciated too!