If there is a Flag manufacture close by they always have "scrap" bags for sale. You can purchase some large pieces for a really low price.
These make great garden flags, wind socks.
I agree with barba, rip stop nylon is the best. Very easy to work with. Does not fade when used outside. Then you have it to make garden flags as well. :)
I use rip stop nylon like you would use for a windbreaker jacket. It embroiders nicely and dries quickly. Hugs, Barba
It seems to me hat Nylon would be the best.