More than that, I do not understand the continued desire to reject professional attire. What is wrong with wearing slacks and a button down shirt? Blue jeans are really not more comfortable than slacks, are they?
And why do people want to push the limits of the professional dress code?
I expect my doctor, my lawyer, and my mechanic to have a certain look, and I appreciate a teacher who tries to elevate the profession by looking professional. Too, why shouldn't we be the first to set proper examples for our students? I feel like when I dress down, I tell my students they aren't worth my best effort. Ten-year-olds probably don't care much about it, but it's a symbolic in my attitude.
I know you can't judge a book by its cover, but if you are the book, you might at least consider putting on your best book jacket.