Tacking up you pony means different thing to different people. Owners may have a special set of tack they find enjoyable on their pony. Or they may have seveal different pieces for a mix/match combination to suit their moods.
Tack can range from a collar and a set of retraints to a fully tacked out pony consisting of: body harness, bridle, bit, arm binder and hooves. Wildfire's dailytack consists of a double-layer 2 1/2" leather collar (locked), a 2" waist belt (locked) and a cb2000 -- He can't trusted to be left free. This tack is on him 24/7 and other items such as hooves, bridle, bit, and bindings are added to fit the occation.