+1 on Ontario's advice. I am also an attorney. A lot depends on the type of firm, law they practice, type of clients. You need to get a little background in that area. In regard to dress, you must go conservative. Blue suit...Brooks Brothers (e-bay). Nice Black Shoes...Allen-Edmonds (e-bay). Matching belt. White button down shirt. Tie...Solid or Striped. (nothing shiny or metallic).
Good luck.
Looks to me like the dress code in the Texas legal community is the same as here in Canada.