The term 'Tack Room Gear' refers to the equipment used in horse riding. The three crossword solutions for this term are REIN (4 letters), REINS (5 letters) and HARNESS (7 letters). A REIN is a thin strap attached to the bridle of a horse, used by the rider to control the horse's movements. REINS are usually made of leather or nylon. A HARNESS is a set of straps and buckles that attach a horse to a cart or other vehicle, allowing it to pull it. It also includes a bridle, which is a headpiece with REINS attached to it. Both REINS and harnesses are essential pieces of tack room gear for horse riding.