Make Custom Panties that Fit Perfectly

With the information in this article from Threads #178 (April/May 2015) by Monica O’Rourke Bravo, you can make as many pairs of panties as you want in any number of colors and styles. Monica writes:
The overall process is fast and easy, and there’s so much room for experimentation with different fabrics, styles, and embellishments to get the desired look. Also, because minimal fabric is required, it’s fun to use scraps from a top you’ve sewn to make a pair of matching panties. I’ll teach you my special secrets for creating your own pattern, constructing basic panties, and applying elastics.
Web Extra: Embellish Panties with Shadow Appliqué
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Where's the Threads Magazine for Android?
I have just signed up for my 14 day trial and find there's no app for Android. very seriously thinking about cancelling as cannot access it easily.
Ditto the Android complaint. Also, where's the "free gift" as advertised? Not worth losing sleep over, however, it begs one to question your marketing integrity.
The article starts out very well and gives useful hints on tracing your own panty pattern, however when it comes to sewing on the elastics I am missing hints on the amount of stretch / negative ease that has to be applied to the elastics. It is not as simple as "fold over the elastic and stich it on with a zigzag stitch".