Three sources for these wonderful silk pins are:

http://www.susankhalje.com/store.html

http://www.shiboridragon.com/Notions-Japanese.htm

Hisako Nakaya, owner of Professional Sewing Supplies of Seattle, WA. You can write for a catalog at PO Box 14272, Seattle, WA 98114-4272 or call 206-324-8823.

I have this book and can assure you it is fantastic! Not only is this information hard to find in print, but much of tailoring has been passed down orally, so has never been written down. Until now. Don't let Jason's warning discourage you - tailoring takes practice, but is also great fun! Just remember that a frockcoat is a difficult tailored garment. Just start with simpler tailored garments, and work up to more difficult garments.

You are absolutely correct - these are not cartridge pleats. True cartridge pleats were common in the past and are lovely, but are rare today. Today, besides smocking, they are seen in the sleeves of academic (graduation) gowns and window drapes. The advantage of cartridge pleats is that a great deal of fabric can be compacted into a very small space. This website shows the different types of pleats: http://www.elizabethancostume.net/pleats/

This website shows how to make true cartridge pleats: http://www.elizabethancostume.net/cartpleat/