What Discworld character am I?

I'd like to dress as a Discworld character for a party I'm going to.

I have an idea which character is most me, but I can't currently think of a way of doing the costume.

So, which character do you see me as?

Now, try and see if you can suggest an easy way of doing the costume for that character...

No, I am not borrowing waveney's librarian costume!