A nineteenth century wit once said “If ghosts have clothes, then clothes have ghosts.” Actually, he missed the mark entirely. Spirits wear clothes because clothes are simply part of the mental image they brought with them from their earth lives. A spirit’s clothes are really just another part of its spirit body. Remember that a spirit’s environment, including its own body image is first formed in its imagination. Just as most of us would not venture outdoors without clothes, neither would most spirits.
As spirits evolve to higher and higher levels, first their clothes and then their bodies change becoming more and more radiant. As they reach the upper levels of the planes of illusion, they begin to lose their “physical” appearance because their bodies become more and more irrelevant to their perceived needs. Once they enter into the higher planes, they no longer need any bodily appearance at all and think and act exclusively with their minds, although they may don spiritual bodies to perform special functions. A part of spiritual evolution is the voluntary abandonment of even the illusion of matter and the assumption of pure consciousness.
Human Spirits that devolve in a downward direction and sink into the Winterlands and below may get uglier, but they still awaken on the transitional plane without their old disabilities just like the more evolved spirits.
Even dark spirits awaken feeling physically better than they did when they died, however, because their spiritual buoyancy has carried them into a lower realm, they soon meet with other spirits of similar narcissistic nature, and so begins a long process of fights and assaults. Over time, their clothes get ragged and dirty, and their perceived injuries accumulate. Remember that they become what they think they are, and they don’t perceive their injuries to heal over time. Therefore, their appearance, already ugly due to their base natures, deteriorates even further. If one of these sub-human entities finds its way back to the earth sphere, usually because of energy supplied to it by an evil living person, it might look to you like a demon or even Satanic in appearance…all of which brings us to the subject of zombies.