This first pattern, the Chemo Cap by Kim Kotary, is from the Red Heart library of free patterns. It's knit with Red Heart Eco-Cotton Blend, though you can substitute another yarn.

Theo Wargo/Getty Following the election, Zweiman and co-organizer Krista Suh designed the hat's pattern with the owner of The Little Knittery, a Los Angeles-based knitting shop. Besides the cat ...

Size adjustments To fit: Toddler - Circumference 38 to 42cm - Hat length 33cm Childs - Circumference 44 to 48cm - Hat length 37cm Ladies - Circumference 50 to 54cm - Hat length 40cm ...

The women have asked volunteers around the world to help sew, crochet or knit pink hats with ears by using simple patterns available on the project's website.

Not all of the hats are knitted. Some are crocheted by women in the group. “It was so heartwarming to read the e-mail Dustyn sent to Kay,” said Jean Cavelli, another knitter in the group.

Anyone planning to march can download a crochet, knit, or sew pattern for the hat on the project's site. Alternatively, people can make and send them to the organizers to give away at DC's march.