Is a neckline still a neckline if it practically hits your belly button? It's hard to draw the line in a culture where pants have gone out of style completely (like, where ARE they going?). And now, V-necks are plunging to alarming depths on the runway this season, too, cascading toward waistlines and making bras seem positively archaic. And, speaking of bras, is it just us or are more and more celebrities and e-shops choosing commando unbuttoned-down-to-there looks? But while the lithe sprites on the runway paint a more romantic picture of this provocative plunge trend, we ask you: On the street or the red carpet, is this look super stylish or just totally trashy?