Several colours to choose from, but ONLY INSTALL ONE AT A TIME! To install the mod, extract the modWitchHunterHat folder from the archive to your "mods" folder. How to get/use the hat in-game? Buy a bird mask from the Elven tailor in Novigrad (see map in image gallery), switch to the Quest Item Panel, then double-click the bird mask to equip the hat. To remove the hat, double click the bird mask that's in Geralt's pocket. To remove the mod, delete the modWitchHunterHat folder.
NOTES: Works best with hairstyles that are close to Geralt's head (i.e. "Shaved with a ponytail", and "Shaved sides, short top, with a ponytail".) Other hairstyles have flyaway hair strands that tend to poke through the hat - would have required an ENORMOUS hat to cover 'em. Also, this hat does not get wet (The CDPR masks are shiny, and therefore don't have a "wet" state... since this hat replaces a mask and the hat has to be dull/cloth-like, it doesn't get wet either.) Will conflict with any other mod that replaces the bird mask.
Other mods for hair/beard/eyes used in screenshots can be found here...