Crop tops for girls with developing breasts are absolutely fine - just because they weren't around for us. Times change, and if a cropped top helps the self-esteem of a 12-year old with a little more than a flat chest, then there's no problem. In fact, its's a responsible action, as it begins to instil some ideas of modesty. One minute we're complaining about teens showing all, and the next about them preparing themselves mentally. As for the padded issue - most bras in most stores are made in the Far East where females are smaller than in the West, and where breasts are not as big as most females would wish (as a result of looking at us fatter people in the West). A walk around any Hong Kong department store or market will reveal that bras without padding are not found. So we have a culture change coming in here as a result of mass production in a country many thousands of miles away. Personally, I hate padded bras, as in fact they provide an impression of a maturity not possessed by the young wearer and can bring unwanted attention. But cropped tops are absolutely fine in my view until a bra becomes necessary to properly support the growing tissue.