It’s Halloween night at Madison Square Garden, and a group of 20-somethings are deep into a sacred ritual: gabbing in the bathroom mirror with your girlfriends. They fluff their hair and touch up lip gloss while discussing the costumes they’re planning for a party the following night.

“It’s so hard,” one of them sighs, “to find something that’s both slutty enough and comfy enough.” Her posse groans in sympathy and agreement.

Luckily, the artist they’re here to see has a solution. Sabrina Carpenter , who has retitled her long-running “Short n’ Sweet Tour” to “Short n’ Spooky” for the holiday, closes out her show with the exact brand of sex appeal those fans in the bathroom were shooting for. She’s wearing a floor-length gown covered in shimmering orange gems with some black spots and

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