There were quite a few Jayne hats, many from the kits or purchased, like this one, but some done free-hand, as it were.
There were these cute crocheted R2D2 hats.
But the most amazing thing was this Wonder Woman costume, designed and knitted by the wearer, Chris Wass, pattern available in her Etsy shop. Now I am not one who would wear something like this, but she totally rocked the look, and had the confidence and chutzpah to pull it off. You go, Wonder Woman!