By the way guys...it's epaulettes , not epilet or epolet!!! Hope your instructing is better than your spelling.
As for uniforms, it really depends primarily on the climate. Also, on your type of clientele. Way back when (in the 80s), my best ever instructing job was in London where we were easily distinguishable from our students and looked very professional. Smart grey pants, white shirts, school tie & blazer. Oh and we had name badges also. No hats, no epaulettes, no wings. Worked well for us and the look did project a professional image which is why a large percentage of our clients were professionals, some with their own aircraft wanting us to teach 'em how to fly it. Also, we were on salary and got bonuses. Ah, those were the days...!!