WranglerMen's 13MWZ Cowboy Cut Original Fit Jeans

What do all of the different letters & numbers on the WRANGLER JEANS tabs designate and what is the differences in the fabrics

How many belt loops?

I read that the black ones run smaller and i read that the black ones are different stretch material. Which one is it?

Do you carry a cowboy cut rigid slim fit 34 x 36 non-prewash in rigid indigo? thank you