I used the Threads aricle in conjunction with the folklore pattern and another source which I got from the net to make two of my traditional kilts. What one lacked in detail or explanation the other filled in some of the gaps. I now have Barbs book as well and am working on another traditional kilt. I use the information from all sources and it gives me a better comprehension on building a kilt. The threads article gives you the bare basics and if it's a kilt you want to make for "Country dancing" It works. If you want a better quality kilt that has a better fit then Barbs book is the way to go.
All the best on your project.
Robert