I know what you mean. I think I have seen it all too - shorts, blue jeans - (worn by a lady in her 70's and loaded down with all the jewerly I think she owned - all diamonds of the best cut though and a ton of perfume), sandals, heel-less shows, oily hair, hair in eyes. What ever you do - just be clean and professional - be aware it is a "dog" show, not the "cat walk"!
T.