Ive purchased so many white tees over the years looking for the right brand, and Ive finally found it.  Ill never buy anything else!  Theyre thin enough to wear under dress shirts, but thick enough to wear alone if you're doing the streetcar named desire thing.  They fit my medium build perfectly, and have enough length to easily stay tucked but not look weird when worn alone.  The V is not too shallow or deep, the construction is solid enough to last a good long while, and they're not too expensive.  Theyre just the best!