I'm sorry for this. I truly am. | 16 Vintage Underwear Ads That Will Give You Nightmares
Real Men Pose Next to Famous Underwear Ads - My Modern Metropolis
Justin Bieber - Calvin Klein Underwear Spring 2015
A simple black t works great. Keep away from white unless it's a purposeful "look" to the outfit. Otherwise, you don't want to show your "underwear" and that's what t-shirt is.
More anatomy tips by moni158 on deviantART. Anatomy, male body, abs
Four real men bravely pose as underwear models.