Because, surprisingly, I ended up with the latest pair of Dior aviator shades. Its not exactly like this one, the glass on mine is two pieces, not one. But its close enought. I've never considered TRYING let alone BUYING a pair of aviator shades before. But the salesperson insisted and so I did. And lo and behold, I looked GOOD. The effect is different from a pair of huge shades, more. . . aviator period (whichever decade that was) and old hollywood-ish. Remember that movie Aviator with Leo in it?-THAT period of glam.
And it seems that our friends Marc and Karl agrees with John, judging from the latest shades from Marc Jacobs and Chanel above.
YSL and Fendi also make some great aviator shades. I love the purple of the YSL one, it makes it that much more feminine.