^ Depends on your facial structure. I have a small face with delicate features so most glasses look overwhelming on me. Sometimes I have to try on the kid's frames, but those usually look bad too. So for me it's almost impossible and forget about designer, I'll take the one pair in the city that doesn't make me look ridiculous, and designers never seem to make them small and dainty enough for that.
But I know for a fact that there are some people who I find can look so good in glasses, even, better with them than without. I especially like ones with some thickness and unique style (but not so much the same emo glasses everyone else is wearing). I guess you need to have a medium to large sized head/facial features to pull that off.