I'm a bit over 6'2" so thought I'd try a long t-shirt for a change.  Most regular t-shirts fit below my belt line.  These cover the crotch.  Expect to see some bunching with slacks.  Fit at the neck is good, fit at the arms is very comfortable.  This is my third set of Jockey t-shirts and I'm not going back to competitors.  Love 'em.