For you Oakley wearers, I hope you don't wear them with formalwear. Plastic frames should never be worn with a suit or tie.
(1) a substantial part of the oakley line-up in metal-framed (in fact, I'd say the majority of the fashion rather than sport line is metal) (2) "with formalwearl?" I'm not sure how many people are wearing tuxes/tails around on a regular basis, much less in situations that would also call for sunglasses. On the off chance that you meant business-wear, I can appreciate that certain sport frames look awful with suits, but by no means can that be generalized to all plastic. Don't forget tortoishell is plastic (barring inane expense and possible violation of endangered species acts), which looks quite good with many suits. Plain old black-framed sunglasses fall in this category as well.