I was amused to see the foolish comment the other day that suggested that women dress to attract men. This is almost never true. Women (and men) largely dress to accrue (or feel they're accruing) status. Teenage girls aren't (in the main) dressing for the boys, its a duel to the death among their peer group. This is also true of adults.

The way men and women derive status from clothes differs - men get a lot from the way their partners dress, for a start.

Cospedal is increasing her personal status with this bit of showing off.