Questions: Fashion & Beauty

I have been growing out my hair for a while, and it's in an awkward stage. I was gonna do a slick back comb over like this
hairartgallery.net/images/2013/03/06182857_8.jpg

Or go back to a simple faux hawk/mohawk like this:
2.bp.blogspot.com/.../Taeyang_mens_hair.jpg

Or should I just get a buzz cut?

Not sure which I would look better with. I had a good experience with the faux hawk/mohawk.

I'd like to know what girls really think about guys who wear vests?

I am a pretty skinny guy. I grew up in south africa and never really cared about wearing a t shirt. Obviously being older than 10 years old means you can't go shirtless and not risk someone thinking you're a douche or that you're trying to show off.

So here's my question. I always thought guys who wore vests were trying to show off, and that there was this douche factor about people who wore them. Now however I decided to give them a try and really like wearing them. When it's 33 degrees outside or even if you go to the gym, it's great not getting a t shirt soaked, or just dying of the heat in general.

Is there really this douche factor, even for someone who isn't ripped or with huge muscles, for guys who wear vests or is it my imagination?