I'm not sure a jacket is a symbol, although perhaps it should be. It's clothes and dress that fall into the symbol category and a jacket is just part of the category. But prior to a fight, don't people take their jackets off? They don't take any other part of their dress off before a dust up. Clothes are exterior but are supposed to demonstrate something that is "other" about the wearer. Uniforms refer to rank, status, occupation and in particular the vestments of religious orders denote the sacred. The colour of clothing signifies something other too, as in white for purity. Yet all clothes also represent something of the interior person, because whatever the case, clothes are not merely coverings, but signs. I'm reminded of the song about the "Dedicated Follower of Fashion". Animals wear no clothing - it's purely a human characteristic and so it's more than just our fur. In this case its about our personality and interior being - but only what we wish to reveal to our community. I came across an excellent saying by Baltasa Gracian Y Morales. "Things do not pass for what they are, but for what they seem. Most things are judged by their jackets." I think in psychotherapy, we start, not by ignoring the jacket, but gradually seeking to divest ourselves of "show" and so reveal our true self. And of course, here in the picture of the window we have the shadow falling on the object. If we took the jacket off, the shadow would still be there.