The undershirt seems like the least important piece of clothing that one could own. It's not meant to be seen... it's an undershirt after all! Some guys don't see the need for undershirts or they think that an undershirt is the same as a regular shirt. Thankfully, the folks over at the Art of Manliness have done an excellent job of discussing the options for undershirts and how to choose an appropriate one for your outfit. Check it out at http://www.artofmanliness.com/2013/06/27/mans-guide-to-undershirts/
The next time you dress up, think about the layers that should go into it. It'll save your dress shirts and ensure that you look at the top of your game!
Frat ~ "Dad" Seth Anthony