Assassin's Coat (3.5e Equipment)
From D&D Wiki
This item appears to be a long coat with many pockets. It gives the wearer a +5 bonus to all Hide and Move Silently checks. It also has 10 secret pockets sewn into it that you can hide small objects in and cannot be found without a Search check DC 20.
Cost to Create: 3,800 gp, 150 XP, 8 days