The platform can also be placed horizontally on a normal table top ...
or on a slightly elevated table top.
A plastic tub with a hole in the lid, several buttons which fit through the hole and two buttons which are too big for the hole.
A string, plaited from fabric strips or ribbon, and tied to form a ring.
Let the child stand in the ring and encourage him to pull the ring up along his body and over his head, or encourage the child to put his head and arms through the ring lowering the ring to the floor. The child will learn many of the movements necessary for undressing and dressing.