A collection of heirloom handknit hats at Carrie Cahill Mulligan’s home studio in Canaan, N.H., on November 18, 2016. With the help of home knitters, Cahill Mulligan is now producing about 150 hats a year. (Valley News – Geoff Hansen) Copyright Valley News. May not be reprinted or used online without permission. Send requests to email@example.com.