The most important thing, when it comes to appearance, is to look congruent and well kempt.
What brand you buy is of little important if any. The most important thing is how you arrange what you wear - how you match your shirts with your pants, and your shoes with your belt etc. Symmetry = beauty in this world.
My suggestion, to those who do not have a flying clue how to dress, is to find a good looking girl, "befriend" her, and get her to come with you to buy clothes. She will give you excellent opinions and set you on your way.
To those who believe that befriending girls is anti-DJ, keep in mind that you are befriending her solely to get shopping advice, which is of high utility.