Olivia Flaversham, Fievel Mousekewitz, Petunia, Giggles, and Flaky have their Halloween costumes. And they would wear them at the Halloween party.
- Olivia Flaversham - Princess Daisy costume that consists of a yellow dress with short, puffy sleeves, white frills on the collar and sleeves, a mint-turquoise daisy-shaped brooch on the chest, and orange ruffles on the sides and skirt of the dress, white frilly opera gloves, a gold crown with a mint-turquoise jewel in the shape of a daisy, mint-turquoise daisy-shaped earrings, a yellow camisole with an orange ribbon attached to the chest, yellow frilly, ankle-length pantalettes, and matching pumps.
- Fievel Mousekewitz - Luigi costume that consists of a green long-sleeved shirt, white opera gloves, blue overalls with golden snaps, a green cap with a matching "L" in a white circle, and brown shoes.
- Petunia - Anna costume that consists of a black sweetheart bodice with off-the-shoulder dark green sleeves and rose, teal, blue, and purple prints on it, a greenish-gold trim, a black satin-laced necklace with a bronze pendant of Arendelle's symbol, an olive drab pleated skirt with sashes (consisting of asparagus centers with pink, crimson, dark olive green, olive drab, and blue prints on it between cream sides) and dark green pleats, a cream-colored petticoat, matching bloomers, white stockings, and black ballet shoes.
- Giggles - Rapunzel costume that consists of a purple dress with long, frilly baby pink sleeves and a lavender bodice, a cream-colored petticoat, matching bloomers, white stockings, and purple ballet shoes.
- Flaky - Merida costume that consists of a Pthalo dark teal cotton Medieval-style off-the-shoulder dress with long arms, gold trimming and beadings, and floor-length skirt, a cream-colored petticoat, matching bloomers, white stockings, and taupe boots.