Product reviews for Cotton Cavalry Shirt

At 55yo, I know what size shirt I wear.  Medium.  This shirt is attractive & well-made, but is HUGE.  The sleeves are ridiculously long & the shoulders are several inches off, if indeed this IS actually a medium, as the tag claims.  IMO, the legend should say that this items RUNS LARGE, or to adjust the sizing chart accordingly.  Dry clean only, my eye.  I hope to be able to shrink this into submission.