Dressing
Well the book was written by Trisha Biggar who worked on the new films, not the old, so has no insight on those costumes.
I reviewed this book for my job. Here's a segment from the review addressing what we're all saying. Maybe someone will listen. It's been known to happen.
"Biggar provides details on the concepts behind and materials used to elaborately outfit Jedis, Siths, princesses, and politicians (note to the publisher: a similar treatment for the OT films’ costumes would be much appreciated)."
Keep your fingers crossed.