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We used an Astrozap shroud (for another scope) as a guide and tried to copy the construction as close as we could.
Black medium density material (non stretchy).
Sewed two "pockets" into the body to take two plastic strips.
Sewed draw strings into each end.
But consider how much material you will need, eg to allow it to fit over the scope with the focuser still in place. (but probably not the finder scope), because the more material there is, the more likely it will sag into the light path, especially if it gets heavy with dew.
I have seen others using "yellow tongue" as the ribs, but they had to be fixed in place each time.
My design is quick and simple use (but not quick or simple to make).
It certainly has proved effective here where the dew has been extra bad lately. But where dew is not a problem, (nor stray light) it is better without a shroud as far as cooling and thermal currents are concerned.
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