It's not just the difference in the label. Different labels cater to different sort of people. What do you look like? What is your body type? Who are you? What do you do? What do you like? What sort of men/women do you like? All these factor into the clothes you wear and help you express yourself better. Some clothes from Sears aren't going to help you do that very well. All they tell people is how lazy or how disinterested you are in relating yourself to others.
Anyway, people who express themselves better are more charismatic. And you could really be an interesting person, but how do people know that at first glance? It's not getting a girl to open her bedroom door just because of your clothes. It's because she can tell whether she'd like you or not.