Thank you for the suggestion @Sewingforfun
I'm not sure what I'd be more confident to tackle, making the high neck on the Jalie or creating a new front on the Kwik Sew. I'm not very good at altering designs of patterns and the thought scares me
You're welcome!
I'd go with the Kwik-Sew, because it has most of the hard stuff already done for you - the raglan sleeves, the high neck, the angled lines on the back shoulders. The rest is actually pretty simple, much easier than the last one, because the sweetheart is just a colour block, not structural like the last one.
What I'd do is this. You'll need some tracing paper (you can buy it for sewing or I often use the stuff from Rymans taped together to make the correct sized piece!). It looks long, but I've tried to separate the steps for clarity.
1) trace off and make up the Kwik-Sew in a cheap lycra to the correct size (adjusting the length if you need to), but without the skirt (just sew the panties part on without it).
2) once it fits, with your DD wearing it, use a marker pen to draw the sweetheart shape on where you want it. If you want those contrast cuffs, mark lines those too, and mark the cutaway back line.
3) decide how you want the skirt - sewn into the leotard lie a skating skirt? Or sewn on the top, which is what the pictures looks like.Cut a test skirt (it looks like a simple half circle in chiffon), and fiddle with that using pins until you are happy with it, and mark the line it goes on, too.
4) make a tracing of the correctly fitting pattern with whatever changes you made including tracing the sweetheart, back lines, etc. If you want to sew the skirt in, mark the new line where it goes, or if you want it on top, merge the panties piece into the main leotard body to make single pieces
5) Cut out your new pattern, adding seam allowances where you need them. Make some straps -
here are some methods
6) make a new toile, preferably with mesh for the mesh parts, and make any extra changes.
7) Cut and make up the whole thing in your final fabrics.