With the global marketing blitzes for films these days, it's not uncommon to see celebrities walking dozens of red carpets in dozens of high-profile looks in so many days.
While it's fun for style watchers, today's never-ending red carpet means a fashion trend can go from a "do" to a "don't" in a heartbeat.
Exhibit A: The crop top.
It looked edgy back in September 2011 when
By then, several designers had picked up on the trend, with Balenciaga's Nicolas Ghesquiere, Rochas' Marco Zanini and