If you have a few tennis balls or an old pair of blue jeans, you can put them, along with the slightly damp bonnet in your dryer (with no heat) and let it tumble for a while. That'll jock it pretty nicely. To make the toorie, make a pom-pom and dunk it up and down in hot water for a few minutes. Don't agitate it; just dunk it and maybe swirl it a little, then rinse it in cold water. Set it aside to dry, and when it's dry you can trim it round with a pair of scissors, then sew it on.
Good looking work!