Here's a pic after the first washing, I love the fraying and just trim anything that's too sloppy.
Very briefly: Cut off the legs, cut up the outside seam so it lays flat, then cut that seam off totally with pinking shears. Cut the second leg open the same way and remove both bottom cuffs. Separate what would be the back leg of the second piece and sew to the front of the other leg after that front piece has been trimmed straight. Use an apron you already like as a template and cut the shape out with pinking shears. Sew bottom cuffs together and pin to each side of bib making sure it's easy to get over your head. Sew a wide, tight zig zag around the perimeter catching the ties and neck piece as you come to them. Sew on the pocket. Wash a few times to control fuzzies/strings and enjoy!