How to draw a person transforming into a chair or jacket?

[Gary N]

How to draw a person transforming into a chair or jacket?
I am drawing a manga for a friend of mine and need to draw a transformation sequence for the story. Its a story similer to Harry Potter about a school of wizards. He wants me to draw a picture of a boy being transformed or morphed into a chair and another boy transforming into a jacket (I think a sports jacket).
He wants them for the cover of the piece so I need to do a really detailed shapeshifting sequence. I have done werewolf pieces and another with a tiger but I have never done one of inanimate objects.
I am thinking of doing it in the style of those Animorph covers (like this image http://www.davidmattingly.com/Media/No_M... ).
But I don't know how to draw a person transforming a chair or jacket. If I draw a chair I guess his head could be the chair rest and limbs the chair legs, but turning into a jacket is more difficult, where would his head and legs go.
If you have any ideas for drawing this piece please tell. Also paste links of similer images.

[Professor Cuddles III]

I cann think of a transformation sequence for the chair, at least.
Kid stands there, wand points at him.
Kid is bent down, hands touching the ground, but not knees. He is wooden (or whatever the chair is made of) up to his wrists and ankles.
Kid's head and shoulders are moving backwards, becoming the back of the chair, turning all velvety and flat. His arms stretching and becoming the arms of the chair. The wood is up to his knees and elbows.
You might want to divide that last one into two panels or slides or frames or parts or whatever to heck you wanna call them.
Last frame is a chair. May or may not have face on the back of the chair.

[Emile]

I would help you, but I'm not too sure myself. Let me know how it turns out though (sorry that I'm not much help to you).