Nice vest but too small! - Kuhl Burr Vest - Mens

I read the comments about sizing on this product AFTER I order, received it and threw away the shipping documents. Soooo, I am stuck with a vest that doesn't fit me. I really like the vest and wear an L in every other vest I own but this one is tight in the shoulders and even though I am in relatively good shape, I have to wear it unzipped. I tried on a lined Burr Vest in XL and it seemed too big but apparently the unlined runs smaller so make sure you order one size up from normal on this one. The exception may be for those with slender builds.