The Accessory Think Tank | 442 followers on LinkedIn. Creating Extraordinary Brands | The Accessory Think Tank (TATT) is a consulting firm with perspective, insights, analysis, and relationships that empower fashion designers to create the next generation of accessories and home décor must-haves. Since 2003, TATT has offered design, marketing, and branding services for designers around the world. Clients range from emerging talents to eminent fashion brands.