For most Halloween-heads, the calendar swipe to October 1 is a celebratory day that brings skeleton yard ornaments and whispered Pumpkin Spice Latte orders. But for Cassandra Peterson — better known as Elvira — the month of the macabre is a little more complicated than that. On this particular October 1, the 74-year-old has emerged from her enclave in Los Angeles to promote her latest project, Elvira’s Cookbook From Hell. Having swapped her jet-black wig for her lesser-seen auburn waves, Peterson is now poking around the crevices of Halloween Adventure NYC, the costume shop that haunts the East Village year-round. She runs her hand along a rack of eroticized cartoon ensembles: Sexy Tinkerbell, Sexy Cookie Monster, Sexy Knockoff Princess Peach. What we’re really looking for, though, is a

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