Confusing instructions

I love the finish dress enough that I want to make another, but I must say the instructions to attach the elastic casing are very confusing. I have been in touch with The Avid Seamstress and they have since clarified it somewhat but the way they chose to do it results in an inferior finish, in my opinion.
The dress itself is lovely and well drafted. I really love this silhouette and it looks very sophisticated – so unlike me. ?
I made a size 2, which is their UK10 equivalent, and it fits me perfectly. Keep your measurements in mind though, as the dress is quite fitted around the hips so there isn’t a lot of ease there. I briefly considered sizing down but I’m glad I didn’t or it would have been too tight. For that reason, I omitted the pockets. I though they’d cause unnecessary bulk around the hips.
The dress is supposed to have a centre back zip but I swapped mine out for a button and loop closure instead.
I’m really pleased with the finished dress. It’s so comfortable yet stylish. It looks like I’ve made an effort when I really didn’t. ?

You can find more photos and details on my blog: https://patsypoomakes.blogspot.com/2019/09/avid-seamstress-sheath-dress.html