I wear an XL and based on the feedback from other purchasers bought a 4XL in this item.  I'm going to be getting a 2XL because going up three sizes was a BIG mistake.  At most go up two.  I like the material, color, and look of the item.  I just wish I had followed my instincts when picking the size.

UPDATE: the 2XL was perfect. I'm 5'6", 185, 38DDD, Size 14