This is a Simplicity costume pattern from 2004; it was number 4956, or display number "0511". It is size variation "RR", featuring pattern sizes 14, 16, 18, and 20 US / 40-46 EUR, and 42-48 FR. The costumes included appear to be vampire, witch, & 'good witch' themed, designed by Elaine Heigl.
Pieces for a cape were cut out at size 16, but all others appear to be completely intact and uncut. All pieces are neatly folded, as are the original instructions. As this pattern was rather big, the envelope has split at the seam (along the glue line).