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.
If you hate the way your teenager dresses, be grateful that she doesn't have green hair and a ring in her nose. The more you resist it, the longer she will cling to it. It will become a battle for control that you cannot win by force. Once you give up control willingly, she is then free to choose an appearance that is less bizarre. Your teenager's need to rebel is in direct proportion to your need to control.