"Homespun" cotton shirts are still the most overrepresented item in the hobby!  Virtually every Confederate soldier was provided with a plain white cotton osnaburg shirt by the government, and you need one for your impression.  These will be made using custom woven narrow width osnaburg with a correct selvedge to exactly match the construction of the original shirt. (Size Regular will fit up to a 42 chest, Size Large will fit up to 48)

C.S. Issue Shirt - 18th Alabama