I really just don't get you guys -- why should the undershirt be different than any other garment in providing an opportunity to add interesting color/texture to a fit? Who cares if undershirts are traditionally white and not visible? It seems like MC logic seeping into the SWD mindset. Snake - Thanks for your opinion but that fit (which I love) would be a hundred times less interesting without the undershirt. Not only does the color itself work very well, but the visible undershirt gives a nice vertical symmetry of casual-ness with the dirty sneakers. As another person who loves color and in fact owns no black clothing, I hate this too. IMHO You're making the mistake of assuming that the existance of opportunity to do something is a valid reason to do it. I think it's cool to wear a T under a button up only in the situation where the button up is a thick very non-dressy shirt like a flannel and left entirely open and I do that pretty often when I'm just feeling grungy and going to the grocery store or something, but if youre buttoning the shirt in any way then shit changes. First of all having the T under the button up adds a layer of bulk which never looks good to me, it always looks stuffy. It also changes how the shirt lays and drapes on you, especially when the T is thicker than the button up, and generally they always are. When the button up is open then its okay because youre going for something drapey and layered and in this case the button up is a thicker more casual shirt, but again it changes when you have the button up closed. One of the most appealing things about a button up with the top one/two buttons open is how the open neck & collar create a V shape displaying your head (like hands holding up your head saying hooray! the head!). Having the V open up but then get obstructed by a t shirt under it sacrifices that awesome thing for the tradeoff of a superficial color. Anyways different strokes for different folks, even though I don't agree with you don't worry all the frat dudes and poorly dressed business casual men in the past decade are totally on board putting some nonsensical shirt on under a button up or polo. Also I swear to god the next person who says "pop of color" will get a free gift of a pop of red in the shape of a knife wound courtesy of me, your friend, naaaaate.