I thought so too. Lived there for 5 years and carried EVERYTHING. (but from a legal standpoint you should google "state knife carry laws" It'll pop right up.
I believe Texas limits blades to 5" or 6". Surprisingly, they are more strict than California, which only prohibits the concealed carry of fixed-blade knives, but has no length restrictions.
But don't take my word for it, here's some resources to print out and read in the throne room: