I personally don't wear Abercrombie for ethical reasons (discriminatory hiring policies and tees with sexist and racist slogans) best-debated in another forum but my cousin who's in high school swears by them. Apparently Abercrombie is considered "high fashion" at her school or something. But she has had several fall apart in the washing machine, which IMO, should not happen when you are buying from a retail mall chain and still paying as much as $40-50 for a simple tee-shirt.
leo&sage is my absolute favorite. i found c&c california to get wrinkly awfully quick, and my james perse tees really shrunk after a good amount of washing.
These past two seasons Jcrew and Banana Republic came out with the best fitting t-shirts ever, I purchased about 6 white and 6 black from BR and several colorful and long sleeve from Jcrew, both are amazing, fitted and long enough to elongate the torso. 100% pre-shrunk cotton, these babies keep their shape.