I made a hood out of a black t-shirt for my evil queen costume. I used a hoodie to estimate the curve, cutting out two pieces. The bottom of the t-shirt was already finished, so I just had to sew the pieces, right sides together. I tried the hood on and determined the right size for the widow’s peak point and the sides of my face. I finished the edges of the face opening.
This hood was comfortable, but extremely warm- it is certainly good for winter wear around a damp, drafty castle while planning revenge on certain young, overly cute princesses.
This pattern could be adapted for other medieval style costumes, such as a jester.