the armpit area REALLY digs into my shoulders/armpit in the small...so i went up two sizes....the large still digs into my armpit/shoulders.  i have i LOVE the fabric though...this is my favor fabric.  i'm thinking of getting the smalls and then cutting and extending the nape of the neck by adding fabric or elastic so it doesn't cut into my shoulders/armpits....and i have a short torso so i would also cut the bottom off and re-hem.  lol.  for the price...that's doable.  :-)  or maybe i will try an XL and XXL and wear them as a long tunic...as the bottom will be very loose and the top should fit...i have muscular shoulders and not much chest.