Well, I'm attracted to red shirts for myself. I own more than six of them, in various materials & with assorted necklines, and I'm not even including the count of my red sweaters in that number. As long as it's a red with a lot of blue undertones -- rather than orange undertones -- it's unquestionably one of my best colors.
But I prefer men in a denim shirt, if they're blue-eyed.
Dark men, I'd like to see in a nice gray, with a red tie, but no more than that.
A red tartan (like Stewart) looks good.
But there's probably really only one completely red shirt for men that I like, and that's L.L. Bean's red chamois flannel shirt.
http://www.llbean.com/webapp/wcs/sto...g=Y&viewTab=VL