Every year I do a few ghost pattern making jobs for Simplicity. Usually it's a Disney movie tie in.
These two outfits were a challenge and a lot of fun.
The instructions say all those wavy cut edges on the blouse and short outer skirt have the option of being hemmed or left unhemmed. But, to get the curled effect like on the illustrations, the edges must be hemmed. Plus the hemming can be in a contrast thread color, which makes the curled hem edges pop. There are two methods that will work and I am going to show you how to do both.
You can either use the hemming feature on your serger with the stitch length set very short or zig zag twice over the cut edges. The zig zag should be set at it's widest width and shortest length. The edges need to be stretched while doing either method for the best results.
These photos will sometimes show the serger and sometimes the regular machine zig zagging. But, the technique is basically the same, except the zig zagged hem really needs to be done twi.
I strongly recommend practicing on some scrap fabric of the same kind before hemming the actual garment,