Enclosure are a custom thing. Like a car, the more features the more they cost.
I have always had my enclosure made out of Sunbrella. Sunbrella is not the only option but it is certainly one of the better materials.
When it comes to thread, Tenara is considered the best but it is expensive. I have had good luck with polyester thread but it tends to be the week link in my enclosure’s longevity but not by enough that it mattered.
I use only coated polycarbonate for windows that I look through to drive. Makrolon is my specific favorite. Makrolon is not cheap but it’s like looking through glass and it has long life.
You will hear things like stratoglass and isenglass. Don’t buy into these names. There are only 3 basic products. Vinyl, acrylic and polycarbonate. Non UV coated polycarbonate often referred to as lexan will tun yellow in three years. However, a UV coated polycarbonate will last a long time (I.e. Makrolon). Vinyl is cheap, not crystal clear, ages better when UV coated, is the most flexible. I use it for side curtains and doors that get rolled up. I use the UV coated vinyl under the name Strataglass.
Then there is acrylic. Clearest of all, least flexible fairly inexpensive. In my book not for enclosure use. However, there are some new developments in this area. Acrylic might become the new go to material. I want to see some more proof before I buy into acrylic.
Again, don’t buy into the hype of fancy names. Make sure you know exactly what the product is. Brand names like Tuffglass mean nothing is it vinyl, acrylic or polycarbonate. Is it UV coated or not?