AUSTIN—Texas Comptroller Glenn Hegar is reminding shoppers they can save money on clothes and school supplies during the state’s sales tax holiday on Friday, Saturday, and Sunday, Aug. 5-7. State law exempts sales tax on qualified items—such as clothing, footwear, school supplies, and backpacks—priced below $100, saving shoppers about $8 on every $100 they spend. The dates of the sales tax…