Originally Posted by Aureus
Ask yourself why it would be inappropriate to teach in a DB if it is appropriate to teach in a SB. As far as the second, I've only had three professors who wore suits while teaching. One did the single breast + vest. The other two did single breasts. One of them wore what I suspect to be the same suit every day. IE if you feel like doing it, DO IT. No one is going to say "Oh he's a great teacher but I can't respect him because he wears a DB suit while he teaches..."
I have something to add to this as well: Functionality. Yes, you can wear a DB suit. However, consider that you'll be doing some arm raising here and there. To look good, a DB has to be fastened at all times. (Just the middle button, please.)* With an SB you can leave it unbuttoned and still look okay. Now, I have no idea what you teach; so if you don't do a lot of chalkboard writing or projection screen pulling down in your class, take this with a grain of salt. *Yes, you can argue that people who don't know the rules won't care, but it does sunconsciously give the image of sloppiness.