You are right that Texas does not require Blaze Orange - ON PRIVATE LAND.
But when you hunt National Forest (Davey Crocket, Angelina, Sam Houston, etc.), and/or the numerous Wildlife Management Areas, and/or numerous Type II areas, BO is required.
Also
Fort Hood (Killeen), Fort Bliss (El Paso), Camp Bullis (San Antonio), etc.
I'm just saying.