Many Texas units had unique ideas about branch of service trim and rank insignia. Whereas in the east, yellow meant cavalry and blue meant infantry, many Texas units had black trim and stripes for cavalry and even infantry. Some even used red trim.
Another thing is headgear. Environment dictates dress, and many Texans had adopted mexican-style hats to protect them from the sun and rain. You saw more wide-brimmed hats in Texas units, along with the fact that Texans seemed to be obsessed with big knives. If you look at pics of soldiers posing in their uniforms, you see more prevalence of long-bladed knives in the hands of Texans, and they carried them regularly, from my research.
It has to be remembered that Texas was still the wild frontier, and the men that came from there mirrored that to varying degrees. That's part of what made them so feared on the field of battle. There's a good chance that the Texas infantryman or cavalryman coming toward you had killed several men before the war even started, or had been fighting comanche for years before the war.