You put your leg straps on the second before you climb in the aircraft. You wait until jumprun to fasten your chest strap and put your goggles on. The exceptionally cool go barefoot, never, ever wear hats or altimeters, and don't believe in pinchecks. Since these folks are cool , they must be good skydivers. They're always borrowing gear, so they must know what there're doing.
Social norms are great.
They give us confidence. We're part of the group. We are accepted. This is a basic human need. We need to know that we are part of the community and that we belong.