Witch hat
A witch hat (), in popular culture, is the style of hat characterized by a conical crown and a wide brim (like akubras and gats).
The origins of the witch hat as displayed today is disputed. A common theory is that it is an exaggeration of the edgeless hats associated with the Welsh and later the Puritans, or an exaggeration of the conical hats believed to stimulate the brain of the wearer. These "thinking caps" are the precursors to the modern dunce cap. Church despised pointy hats given that the points were often related to those of the devil's horns. The witch hat is a more brimmed version of the cone-shaped hats commonly worn by male-gendered wizards and magicians, as the hat was more brimmed for it to be female-appropriate. As of the Victorian era, fairy tales began depicting black-colored conical hats and crones as symbols of wickedness in their illustrations. Another possibility is that in Luna, a town of the Etruscan civilization, there were coins on one side depicting a goddess commonly associated with witches, named Diana, wearing a brimless, cone-shaped hat.
The Four Witches
The human skull and bone left on the floor are intended as either reminders of death, or symbols of magic and invocation. The witches interpretation may be misogynistically linked to the "Malleus maleficarum" ("The Witches' Hammer") the "virulent diatribe" written in 1487 by the Dominican friars and inquisitors Heinrich Kramer and Jacob Sprenger. The book endorsed the extermination of witches and so developed a convoluted and detailed legal and theological theory to justify its treatise. 
Because the women's hands are largely hidden, it is not supposed that the image refers to any specific activity or event. However it was at the time commonly believed that men who had sex with so called she-devils would later suffer from illness and impotence. Around 1500 Durer produced "Witch Riding Backwards on a Goat", which, according to art historian Margaret Sullivan, like the current work, reflects "a fascination with the underside of the ancient world rather than an interest in witch manuals or a compelling concern with witchcraft as a punishable offense." In this context, the engraving is sometimes examined alongside The engraving resembles in a number of ways Hans Baldung Grien's "Bewitched Groom", completed the year before before his death in 1545. However, it is important to note that Dürer and Baldung's works, while contemporary with the "Malleus maleficarum", come before the widespread outbreak of moral panic leading to the witch-hunting of the later 16th and 17th centuries. According to Sullivan, "The work of Direr and Baldung belong to an earlier era, they testify to a different sensibility and were produced by artists who could not have foreseen the terrible times to come"