How would I recreate this?

This is my first time on this forum, so hi!!!

I would love to know how I could recreate this edge.
I can see that it’s created from cast on, but I’ve tried everything I can think of to recreate this wonky, uneven hem.
As you can see from the purl side, it’s hasnt been created from holding stitches back.

Does anyone have any ideas?
Thanks so much in advance!

In two words? Short rows.