Children who are given some control feel less need to rebel. It's a parent's obligation to provide a child with the necessities of life. The luxuries are optional. The parent gets to define what is necessity. If the child wants more than that, she can pay the difference with her own money.
Shoes are a necessity.
Designer tennis shoes are a luxury. Stereos, TV's, VCR's, and CD's are luxuries. A car of her own when the child turns 16 is a luxury. All teenagers think their parents are embarrassingly weird. All teenagers find it humiliating to be seen in public with their parents.