Thank you so much for your reply. My father has now been elected as company historian, as he spent countless hours emailing people and following leads, etc, etc. He finally did find a reliable source for the uniforms and acoutrements of the 26th TX. You are right about the Blandford book! I don't know where they came up with that one! You're also probably right about the Houston Depot supply. Although, from what most historians say, not ALL the jackets had yellow trim, but since there's not absolutly confirmed "Houston Depot Shell Jacket" we can't really know! :) Also, in the early war, apparently they had undyed wool uniforms and other units would BAH at them like a sheep when they went by!
They were also issued black felt pillbox-crown hats with medium brim. They also apparently had brogans rather than boots that they got from the San Antonio US Depot.
Another of their major sources (as sort of mentioned above) was the San Antonio Union Depot, that they raided, so they had US acoutrements as well as CS. So US sky blue pants, great coats, etc are appropriate for the 26th. As well as cartridge boxes, belts, holsters, cap pouch, canteens, haversack, blankets, etc.
For revolvers, the field and staff are the only ones documented to have them, except for Co.'s A and K who had quite a number (lots to list!). They also had the P53 3-band Enfield Rifle, Sharps Carbine, muzzle loading double barrled shot gun (12 gauge), and as you said, Hall's Carbines (although the Hall's were not documented in co. K, which is what we portray), and other sporting rifles. As for sabers, Co. K and G had only 5, while the other Co.'s had full compliments.
Well, I hope that was helpful to anyone that was interested! My father has a whole lot MORE information on the 26th TX.