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I used circles of plastic 'cable snake' to form hoops attached by adhesive velcro to my 16" GSO Strut Dob. Just two hoops were enough to prevent shroud sag into field of view. They sell 'cable snake' on ebay. I spray painted the snake black, and the two end can be put together with a short garden hose splice, adhesve velcro from Bunnings. I know other IIS members have used the same technique.
As to shroud material, I bought a custom fit shroud from Astrozap, i'd look there first as they make them for most production scopes. For custom shrouds on the 10" newt I built I just used Lycra, It's stretch enough to give a good tight fit with no sage but can allow a bit of light through the 'pores' but usually only perpindicular to the scope sides.
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