Everything I used for this costume came from a thrift store. I used a white graduation gown, white gloves, tights, and spray painted a pair of shoes white. For the headpiece I used a white headband and a long white scarf to fashion as a Nuns hat.
For my face I used a light foundation base, then theatrical white paint dusted with a white powder. For the eyes I used a black gel liner with a paint brush to make the eyes look like they were bleeding black. My eyes are very dark, so no contacts needed.
Whereever I went I walked in slowly and stared at people not saying a work, it was quite effective.