I ordered one white shirt size small and fell in love so I had to order another in blue. I typically wear a size small but if you have a large chest youll need to siz up. I am a 32C, 58, and 125 pounds.  The only thing I would change if Given the chance would be to make it a few inches longer due to my torso length, but it is long enough to tuck into my slacks, just comes out easier without ample length.  This is a must have!