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You can make it a little bigger when you cut it, to make sure that the person can fit his or her head through the sheet.  Cut in jagged lines for a ragged effect. Do this with fabric glue. This will create a spooky effect. You can glue more tattered triangles to the person's shirt so that they hang down like icicles. The person should be able to easily put his or her head through the top hole and his or her arms should fit neatly through the arm holes. Cover all parts of the face, even the eyebrows and lips. You can also put the makeup on the person's neck, since it will be visible. You can either paint the lips, or leave them covered with the white makeup. This will create a dusty look.
Drape a sheet over the head of the person wearing the costume. Draw a circle onto the sheet around the person's neck. Mark the area above the person's elbows. Mark the area below the person's ankles. Remove the sheet. Cut a circle around the circular area you marked for the head. Cut arm holes through the marks you made above the person's elbows. Cut along the ankle line. Take the leftover scraps of fabric and glue them all over the costume in jagged, triangular shapes. Ask the person wearing the costume to put on a white long-sleeved shirt. Put the sheet back on the person. Apply white face makeup all over the person's face. Draw gray circles on the person's eyelids and under his or her eyes. Sprinkle flour through the person's hair.