Linen-silk blend sportshirt is available in an array of colors, tailored for a trim fit and accented with military detailing. For an example of fit, a size M chest runs about 44 inches. Ralph Lauren's Custom Fit is somewhat slimmer than the designer's Classic Fit, with slightly higher arm holes, narrower sleeves and a more defined silhouette through the body. If you're looking for a trim, athletic fit, then Custom Fit is a good choice. For a looser, more relaxed look, Classic Fit may be a better option.