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Don't forget that men need chemo hats too. My senior citizens group here in Ewing, NJ tries to knit and/or crochet an equal number of hats for women and men. Men don't always like the baseball caps since the seams are very rough on tender skin. We also stay away from wool yarns because of allergy problems and the chances that the hats will end up in washing machines.
We knit and crochet chemo hats and preemie hats for the hospital year round as well as lap robes for some of the local nursing homes.
Good luck with your campaign!