The embodiments herein provide a foot supporting apparatus/accessory device for chairs and seats. Each footrest comprises a base for supporting a foot and connected to a ring through a pair of strings passed through a pair of tubes. The ring is coupled to a hanging mechanism attached to clamp for attaching the foot rest to the back of seat at the front of a passenger in train/bus/airplane. The base is a fabric foldable to take a shape of the foot of the passenger in hanging condition. Several knots are provided at a plurality of locations along a length of the hanging mechanism. The clamp is engaged with a knot based on desired height to hang and hold the foot rest at a desired height to provide a desired leg space to enable the passenger to move the foot freely and at any degrees of freedom.