Justin Gargasz needs one of these to wear along with his Vessel Jacket: A raincoat that turns into an armchair. The writer at Found_NYC has the one shown above, from 2002. It was produced by Italian clothier C.P. Company and designed by by Moreno Ferrari.
Does not look very comfortable either as a raincoat or an armchair. it was written about in the New York Times: When Inside Out Equals Outside In.
Found_NYC also has a rucksack that turns into a jacket. at Found_NYC
Suggested by Ben at sustaiNYC
More on wearable furniture:
Carry Your House on Your Back With Vessel by Justin Gargasz