A little about me: 6ft, 180#, slightly muscular build. The J.Crew Slim fit still fits me like a tent, so I spend more money to put on a bunch of fabric. Just not with this shirt. I went with the medium. It's the thin style. Slim. Sleeve length is great (35/36"). Collar is comfortable when fully buttoned (neck 16.5"). Does not stick out when loading. My only downside is that the shirt isn't very long so it might not be suitable for tucking in for some.
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