I wore an open Hawaiian shirt over a bikini top and shorts, a "uniform" that stuck with me in my freight days. The students I got were the ones who had been dreaming about learning to fly their whole lives, and only now could afford it, not career pilots. The only "duck faces" they saw were the ones they shot (Arkansas has the best duck hunting anywhere)!
I can't wait to retire, if only to burn my pile of marching-band inspired uniforms. I can't imagine having to wear that sucker from the discovery flight on up.