McCall's 1955 1980 sun or slat bonnet
Amber Jean and I are not sure we see the point of wearing a sunbonnet with a bikini. Isn't that kind of like wearing a cargo miniskirt--self-contradicting, by definition?
The neck curtain thing is called a "bavolet". I feel like that should be the secret bonnet password. You go, "Pssst . . . bavolet," and if she replies with a knowing nod, you've found a fellow, um, bonneteer.