How's this for an angle. . ?
I feel uncomfortable when I am wearing a collar and tie, so I feel grumpy and I am sure this degrades my instruction. Conversely, I am happier wearing casual clothes but I know I am under scrutiny from new students. I therefore feel my standard of instruction must rise to prove that although I may not look like a . . err. .747 captain (in an R22) I am an experienced professional. .
