Cut another strip as wide as the apron and as deep as you want it. Sew it along the bottom edge of the top piece. I just sewed it right through the blue 'lining' apron.
Fold and press. Repeat this with as many strips as you want. Mine only has 3. I'll show you the rest next post, as well as the bias tape I made for it.
BTW, almost finished one sock and 90% done with the other. They look sort of weird but they fit. I also have two rows stitched together for the snowflake blanket and five snowflakes ready for the next row. Picture soon, I promise!