To start, work buttonhole stitch from the bottom of the design.
#. Take care to work uniform loops and dont pull the thread too tight.
Bring up the needle just above the first layer of buttonhole stitch.
first loop will be formed.
one net knot is formed.
Once again pass the needle under the same loop and pull through. Repeat the same till you reach the other end. Now pass the needle through the fabric and bring just above
Now work the outline with chain stitch or stem stitch.
#. To work on irregular shapes you can add or skip the buttonhole loops as and when needed per the design.
you can see my project with this stitch here.
Hope this tutorial helps you. If so drop a line and I will be glad if you share your experiments/projects with me here.
Have a nice day..