You can also check out Coon River Merchantile in Des Moines. Most authentic CW and IW uniforms I have ever seen. They did my Confederate General's uniform with which I have won many awards, especially in NCOWS (you know how picky they can be). There is also a sutler in Livingston, TX, who did my IW/GAF Chaplain's uniform, but for life of me I cannot remember their name...maybe Mercury Sutlers. Have fun in your search as that is half the fun of getting something authentic.
God Bless and shoot safe.
LTC Montgomery Little, Senior Chaplain, GAF