This one is a bit too light, but you can make a pot of black tea and dunk the vest in there to stain it, and paint the buttons silver with acrylic paint (if you wish). I'd say amazon is a good place to look for a pinstripe vest, and look for accurate form of it rather than the color--you can very easily dye light brown or khaki fabrics with dark brown RIT dye (found universally in craft and even grocery stores!) to match the shade. Then you can dirty it up with acrylic paint and blood and such to give it that bloodborne charm! Keep us updated (: