You will need:
Using plaster strips, make a little half mask. Don't forget to lube your face with some lotion!
When the half mask is done, start adding some foam to protect your noggin. Nothing too thick, you dont want the wolf to have a huge balloon cranium ( or maybe you do, whatever) With the foam added, now make a little elastic bit to hold it on. Sew it into a ring and add a lttle hot glue to the sewn parts to make sure it stays. Add some strips over the foam to make it more solid.