For the decorations and etc. you may wish to consult the paperback "The Missouri Guerrilla Clothing and Accoutrements," 2002 by Moel A. and Mary Ann Crowson, published the Crowsons. I have seen this little book sold in some of the Missouri area stores that specialize in MO CW matters, or you could purchase a copy direct from the Crowsons at The Baker Plantation House, 60 Booneslick Road, Danville, MO 63361. Another option would be to see one via interlibrary loan.
I have noticed from earlier queries in this forum that there is great interest in making guerrilla shirts. I wore uniforms of one kind or another for many years, so I will leave all that to others.