Could you tell me how you observe the performance of gap shop? What is your method of measuring its sales? So I can apply it and report the feedback to you.
If you really want do it professionally, may I suggest you to make a questionnaire and ask all people here to send it to their friends?
I am in the UK now. In the UK, many young people prefer Topshop.
In my eye, the fashion of gap is a bit conservative, but ok.