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The problem with many of the good repros are that they fit best if You are slim. I'm not, so I buy my chambray shirts from Lands' End, who make their shirt in a regular fit.
https://www.landsend.co.uk/Mens_Chambray_Work_Shirt_/pp/P_41037.html?cgid=11382&dwvar_P__41037_color=YT5