To emphasize the point on the value of signaling - I know plenty of people who actively avoid branded items that could easily fit into their budgets because they think it's ridiculous to pay the premium - this is also signaling, especially if you belong to a tribe that knows you have that sort of money. Gets lost in the mental calculus of why a person buys a certain good (value, function, etc.), but as another commenter pointed out, luxury designer brands often fit better which makes the wearer look better, and the decision is rarely just about about which item provides more value for the 'cover a part of your body' use.