Terry, double thickness of fabric is much better and more sturdy than a single thickness. Depending on the pattern, the apron can also be 'reversible' if you use two coordinating fabrics.
I also like to quilt mine with one layer of cotton batting, but that's not necessary. The next one I make may have a 2nd layer of batting near the bottom, in case the owner wants to use it for a pot holder.
So far, none I've made have pockets, even though the patterns call for them. Why? Because I can't figure out what I would ever put in an apron pocket!
True confession time: I have aprons, but don't use them! They hang over a corner of my pantry door, just looking beautiful...