Advice on hair for halloween

So I have very very thin medium length hair. I am being Mary Sanderson from the Hocus Pocus movie and my friends are being the other two witches. I have tried to get my hair to stick straight up on a bun kind of thing like Mary’s. Would it be terrible or out of character to do my hair like this picture above? I feel her hair is what defines her haha. The picture below is what her hair is kind of supposed to look like. It’s the wig they sell to look like her hair but I hate wearing wigs!