Went with the matching vest. It wasn't the most popular option here, but I felt like wearing a vest. Hmm. I guess I get what you guys are saying, and probably will still do the gray/green combo occasionally. But I am a little more comfortable in today's fit. Yes, covert twill. Brooks Brothers sold them as cavalry twill, but that's a slightly different weave. I have them in gray and olive as well as tan, and love them.