I think a coat and tie may be a little over kill, but I do agree that,like it or not, people/sports are judged by perception/looks. It is human nature. There is not that much difference between a pair of Docker pants (100% cotton), DrMartin shoes (leather uppers with thick soft soles), and shirt with a collar (again 100% cotton)...than jeans, sneakers, and T-shirt with regard to comfort. The huge difference is perception. If the attitude is "screw it, I don't care what they think", then don't be bitter or angry becasue pool doesn't get respect. This is the very reason it gets none.
One of the reason's pool hasn't gotten respect is that is still associated with hustlers, smokey bar rooms, cheats, gambling, and so forth. Until this type of perception is overcome, pool has absolutely no chance of becoming main stream, or getting much if any TV coverage (we are talking more money/sponsors/ bigger purses and so forth). Anyone that thinks sloppy looking shirts, pants that show your a$$ crack when bent down to make a shot are going to "help out the sport" are sadly mistaken.
I personally play in shorts, flip flops, and T-shirt, but I don't go to work in that attire I can assure you. When it comes to making money, I at least try and dress the part so a positive image is put forth.