I'll have to see if I can get a hold of that book, it sounds awesome!
Other than that, try starting with modification instead of complete drafting. Know that you need a poofy sleeve, but the only commercial pattern you can find has one that's too long? Cut it down! Need to add a collar to a jacket? Find something similar, but change that one detail!
With modification, if you screw up, you can usually still piece together what the original pattern was and re-start again from there if need-be. It's a good way to make semi-accurate patterns specific to multiple cosplays, and nail all those pesky details!
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- Judal (Magi: Labyrinth of Magic): 16% (Wig Overhaul) Katsucon 2017
- Galaxy Print Shiro (Voltron, Original Design): 70% (Arm Work) Katsucon 2017
- Blanche (Pokemon GO): 82% (Sewing) Katsucon 2017
- Lelouch [Emperor Robes] (Code Geass) : 4% (Patterning) 2017