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You don’t need a full costume — a plain black dress plus the right accessories becomes at least 14 different characters.
My top pick: A plain black dress is the most versatile Halloween base — add one accessory and you’re a witch, a cat, a vampire, or Audrey Hepburn.

1. Witch: Add a Hat

A witch hat and a broom turn a black dress into a classic witch. Shop witch hat broom halloween on Amazon →
2. Cat: Add Ears and Tail

Cat ears, a tail, and whisker makeup — done. Shop cat ears tail costume set on Amazon →
3. Vampire: Add Fangs and Cape

Plastic fangs and a cape over the black dress — instant vampire. Shop vampire fangs cape set on Amazon →
4. Wednesday Addams: Add a Collar

A white Peter Pan collar clip-on transforms it into Wednesday. Shop wednesday addams white collar on Amazon →
5. Audrey Hepburn: Add Pearls

Pearl necklace, gloves, and a tiara — Breakfast at Tiffany’s. Shop audrey hepburn costume accessories on Amazon →
6. Bat: Add Bat Wings

Clip-on bat wings attached to the sleeves. Shop bat wings costume adult on Amazon →
7. Devil: Add Horns and Pitchfork

Red horns, a pitchfork, and red lips — instant devil. Shop devil costume accessory set on Amazon →
8. Skeleton: Add Bone Makeup

White face paint to draw a skeleton face and rib cage. Shop skeleton face paint kit on Amazon →
9. Ghost: Add White Veil

A sheer white veil draped over for a ghostly effect. Shop white veil ghost costume on Amazon →
10. Morticia Addams: Add a Long Wig

A long straight black wig and dark lips. Shop long black wig morticia on Amazon →
11. Spy: Add Sunglasses
Black sunglasses, red lipstick, and a trench coat — spy vibes. Shop spy costume accessories on Amazon →
12. Flapper: Add a Headband
A feathered headband and fringe necklace — 1920s flapper. Shop flapper headband costume on Amazon →
13. Dark Fairy: Add Wings
Black fairy wings and dark glitter makeup. Shop black fairy wings costume on Amazon →
14. Witch Doctor: Add Beads
Layered beads, face paint, and a bone necklace. Shop voodoo costume accessories on Amazon →
The bottom line
A witch hat is the fastest transformation. Cat ears are the classic fallback, and a Wednesday Addams collar is the most clever — one tiny accessory, perfect costume.