If you think about it, you will agree that Mozart and sneakers do not really go together! This music has always meant white (ceremonial) shirt with dark trousers or skirt, or a waistcoat and a bow tie or tie. Shoes should also be dark.
This type of dressing-up for the public performance shows your respect for the events which you have participated in and for the audience. As the music is a part of culture, this kind of dressing-up can be called the cultural dressing-up.
Taken from my book