Guilty feelings about clothes are totally unnecessary. A lot of people earn their living by making clothes, so you should never feel bad.
The fallacy in Peter's mind was this: he believed his relationship was dependent on his consistency in producing the qualities he thought had earned him the Lord's approval.
What makes you wise is not what you learn, but what you practice. What makes you wealthy is not what you earn, but what you invest. So, invest in what to practice, and practice what to invest.
You have to really want and need it before you earn it.