Im currently 6'5 and weigh in at 165 pounds, very slim so medium t shirts fit me best in chest, arms and shoulders but I need atleast a large for length usually!   This is my first post on this forum so I'm not sure if its predominantly UK or US members but I've recently started buying 'small' oversized t-shirts from top man, which are slim but very long and fit great.   I can still get away with the occasional medium t shirt from river island and a few other...