The question which needs to be addressed is the context. Who, what and where. Travis hit the nail right on the head. Though all good answers It cannot be simply answered by looking just at photos or just reading a chapter in a book or just ageing a "type one" jacket. What is the merit to a modern typology anyhow? (thats rhetorical). When looking at the 4th Texas for example and really digging into the records for them we can see spotty issuance right after Seven Days to a bit of the brigade. But what? From who? These questions are only partially answered by primary resources. Did they have a chance to hit any stores after 2nd Manassas, probably not... So what they looked like takes detective work. Taking a bit from Tom's book, extant uniforms (or potentially extant verigated jean sleeves), reading returns, letters, looking at pictures and archaeological resources we can piece together a partial image. The 4th probably looked rough, there was probably little uniformity until their complete re-issuance at Fredericksburg later that year, probably a combination of enfields and older smoothbore guns, probably a combination of Texas/Georgia/private purchase and maybe even Richmond Depot made things. All the primary resources, even those often forgotten like archaeological records needs to get stirred together. Like a good pie based on experience and your tongue you probably have a good idea whats in it and its not until you read the recipe that the nutmeg becomes noticeable.
3rd Regiment USV- Buffington's Boys
Atlantic Guard Soldiers Aid Society
Backus's Bodacious Battery- PNB Artillery Crew
"...mow hay, cut wood, prepare great food, drink schwitzel, knit, sew, spin wool, rock out to a good pinch of snuff and somehow still find time to go fly a kite." N.B.
Now thats living history.