Are you looking for the leather to make the linings? Purse lining you can purchase at the fabric stores. Ask for the lining material, there are differet weights and multiple colors available. For the organizer insides, I have been purchasing organizers and dayplanners off of Overstock and removing the guts and recovering them, less expensive than buying the kits and I can use better leather for the out sides. This also works with padfolios and binders. You can also purchase the zippers seperate and use an existing organizer for your pattern templates.
Hope this helps... I will be posting a pic of a padfolio I am making, I am almost done.
Justin