It's wrong to keep returning the things you bought.
Sabrina is very poor and doesn't have good looking clothes, but is regularly invited out on dates.
Sabrina wants to impress her friends with her sense of style.
Sabrina goes to good will and spends a few hours putting together multiple outfits from their charity bin.
Every time Sabrina has a date she goes and buys new clothes, and then returns them the following day.
Sabrina's dates all comment on how well she is dressed.
Sabrina is eventually blacklisted from every store she has returned clothes to.