To “Somebody”. Why are you dressing to impress other women, like many other things in life done to impress other people, it implies some sort of insecurity.
Moreover, this drive to impress other women is the exact opposite of “tzniyus”. Not tzniyus as defined by hem lines and the amount of curves shown. “Hatznea Leches” includes how one condutcs themselves in public. “Walking the runway” modeling your clothes for other women is not “hatnea leches”.