We all know that one of the litmus tests for whether or not one is truly a global icon is whether it takes a last name to identify you. Are you a one-word wonder, like Cher, Beyoncé, Oprah . . . or Diana? If so, your place in the pantheon is assured, sometimes for generations. And so it is with the late Princess Diana. Every generation "rediscovers" her appeal and the elements of her iconic fashion style. And tweaks it just a bit to make it their own. The latest example of this ongoing phenomenon is Gucci. This week, Alessandro Michele launched a new bag, the "Diana." And within days it has become all anyone wants to talk about when it comes to accessories. Here's what you need to know about why Gucci's new Diana bag has hit it big this summer in the world of luxury accessories as an "it" designer handbag and tote. Should you get one, you ask? Um . . . yeah.