What is the sexiest clothing for a guy to wear?

Just find a style that fits you and your personality. There's not a specific clothing that can make any guy turn into a sex symbol like brad pitt or david beckham. You just have to find what works for you through trial and error. When you know you have that feeling without questioning what people will think of what you put on everyday before you go out then you know you have your own style and swagger.

Anything classy. Button down shirts and well-fitting jeans or nice pants, especially black dress pants and a shirt in a color that looks really good on them.

most of the time right now, its plaid. Something that matches your hair or eyes. usually blue is a nice color. But something i always like are rugby shirts and polos. They just look nice. AND v-neck t shirts. if you have a nice collar bone it is soo hot. any color neutral color. Like gray, white, navy, black.

Jeans and a T-Shirt. Or Plaid goes good with anything. Also colored shirts. Something that goes good with your eyes.

if they have a defined and muscular chest i absolutely love a v-neck shirt. and a nice pair of fitted jeans