There are several excellent books by Edward Scott Meadows and R. Stephen Dorsey on holsters, belts and accoutrements. These may be expensive to buy, but you may be able to find one in a larger library.
One thing to keep in mind is that early in the CW, much of the leather equipment worn by Confederate regulars and militia followed the pre-war patterns of the Federal Army. Much equipment was taken from Harpers Ferry Arsenal. In some instanses, where CSA troops obtained waist belts with U.S. belt plates (buckles), they turned the belts upside-down. That wasn't possible with regulation cavalry sword belts, unless the Sam Browne straps were cut off. Most of this equipment was colored black. Later in the war, CSA and Confederate state troops utilized whatever could be fabricated. If carbon black was in short supply, then finished leather was often dyed with various homemade or at least whatever was available. That also applied to uniforms.
The military style, butt-forward, full or partial flap holsters were quite commonly used by veterans after the war. In some instances, the wearer might cut the flap off for easier access. There has often been opinions posted by misinformed people about the reason for the butt-forward holster, worn on the right side. While it is true that cavalrymen wore their sabers on the left side, which would have interfered with drawing the pistol from a left-side scabbard, the holster could have been made for a butt-rear carry on the right side. The statement that the butt-forwad, right side holster was due to a mistake by a manufacturer, and utilized anyway is completely false! This can be proven by the fact that the Army kept the butt-forward, right side design was kept until the first semi-auto pistols came into use, about 1906. Field expedient modifications and general evolution of design led to the more common, loop-style holsters of he 1870's and later.