As you browse my patterns you will see the required skill levels marked with my butterflie(s) 
. You may wonder what does it mean. I try to give you some hints what those are about. The following table helps you to understand it.
| | | | |
| X | X | X | X | Straight stitchline |
| – | X | X | X | Zipper sewing |
| – | – | X | X | Curve to same curve |
| – | – | – | X | Curve to straight or to different curve |
| – | – | X | X | Zipper pocket with zipper pads |
| – | – | – | X | Zipper pocket without zipper pads |
| X | X | X | X | Interfacing |
| – | – | – | X | Rounded strap |
| X | X | X | X | Folded strap |
| – | X | X | X | Magnet closure |
| X | X | X | X | Slip pocket |