The way i figure it he was in a form similar to the Nazgul, who, although more or less just a shadow, could still wear clothes, or even wield a sword. And therefore cetainly wear a ring.
In the Tolkien world there are many diffrent stages of living. As compaired to our living or dead world where there is no in between, just something to think about
RyAN
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"Yea, though I walk through the valley of the shadow of death, I fear no evil, for thou art with me"
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