This blouse is made from 100% wool twill. There is a comparison picture to an original held by a private collector and was up for auction. The pictures of the original can be found athttps://poulinantiques.hibid.com/lot/23431-247207-145533/extremely-rare-civil-war-union-enlisted-4-button Please by all means look at this beautiful piece of work and compare it to ours. There are many pictures of the original blue as well as a wonderful description.