Required: approximately 50 centimeters of stretchy fabric, depending on your measurements.
1. Fold the fabric in half lengthwise.
2. Place all patterns on the fabric and cut out all patterns with seam.
3. Sew together in the middle back (E to E).
4. Sew the back piece together, D against E. Sew this in place.
5. Sew the front piece together, C against B. Then RM against A. Sew this in place.
6. Sew the front piece to the back piece.
7. Fold the shoulder straps lengthwise and sew them closed. Now turn the straps over and sew them off.
8. Now sew the covering together. H vs. G, I vs. J. GH vs. IJ.
9. Now sew the zipper in the middle at the front.
10. Now sew the facing. Pin the ties between the fabrics so they are instantly secured.
11. Fold the seam of the facing towards the facing and topstitch.
12. Finish the floor.