Unfold apron pieces. If you want a color-blocked apron, align bottom edge of top piece with top edge of bottom piece, right sides facing, and sew across. Press seam open. Sew double hems to finish armhole edges: Fold over 1/4 inch, press, fold over again 1/4 inch, press, and edge-stitch. Finish sides with double hems: Fold each side over 1/2 inch, press, fold over again 1/2 inch, press, and edge-stitch.