There are many reasons why every man wants to buy the best v neck undershirt. However, buying the right undershirt with a v neck style that fits you properly can be frustrating. In fact, some men wear old undershirts because they are unable to find their replacements. Others do not wear undershirts. However, if you are not wearing undershirts with your dress shirts, you need to start. A quality undershirt is a requirement for wearing most dress shirts and other outfits that are not t-shirts. This is because undershirts soak up body oils, perspiration and deodorant among others. They keep the outer shirt dry and clean.