Modest options to fit dresscode

Hi everyone, I want to know more about the dress code as as an ALT. I'm a very modest person. I wear very large clothes and I'd like to wear dresses while teaching. Is it okay or too casual? What could make the outfit okay? Does anyone have recommendations for large blazers to wear maybe, or large sets? I don't show my arms or any cleavage and my outfits go down to my ankles. Thank you

by Reasonable_World4565