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I used black outdoor carpet!
It is fluffy on one side, stippled on the other and stiff. With the fluffy side facing out, the carpet can be rolled around the outside of the trusses, and can be secured with strips of hooked Velcro. (Velcro adheres directly to the fluffy stuff) The inside surface seems to soak up light, and the stippled surface stops any reflection.
Being stiff, there is no sag to obstruct the light path, and you can extend the shroud past the top of the scope to provide a dew shroud to reduce secondary fogging. Cut outs can be made to accommodate focusers, finders etc.
I have used the shroud in very dewy conditions and found it excellent, with no moisture penetration to the inside. it is necessary to dry it after use, however.
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