This is nothing but a bad thing. People are just parroting nonsensical gibberish that has been beaten into them. There is no such thing as dressing professionally as a universal standard. All this does is exclude people of various cultures from relating to fighters in another way.
They aren't working at some retail store like walmart they don't need uniforms for the customers to recognize them and ask them for help. When they start wearing armani suits while punching each other in the face that will become their professional attire.
You can't tell me any of you ever gave a shit when these guys wore tshirts or timbs or thought less of them for it.