All our patterns and plans will be available on our deviantART page, eziocostumeproject.deviantart.com. The direct links are posted below.
HIDDEN BLADE: current version 1.2.2
Here is our source for making patterns for the doublet & tunic, although costume-specific instructions are posted in the Guide.
The ideas and basic patterns for the hidden blade design were got from here (Youtube video), here (Jay Jeon's portfolio) and here (Exotic Automatic weapons forum).