I have been pondering means of covering a pergola for a while, and didn't want to go the shade cloth option, or for that matter the dreaded clear plastic stuff.
We don't need waterproofing and I didn't want to put too much extra load on the structure.
The solution was to get our friendly neighbourhood canvas goods maker to sew some 250 mm wide strips of vinyl cover material, which I "wove" between the beams and lashed at each end with yacht fittings.
Cost to cover a 2700 x 1800 wide area was $125 including fittings, which I think is one of the better value purchasers I've made all year!!
I'm so happy with the result I thought I'd show off!
Cheers,
P :D :D