While Lincoln teaches her how to drive, Leni wears her "special driving outfit". It consists of a turquoise dress, skirt, gloves, tights, and white boots. The outfit later includes a turquoise helmet with white goggles.
When Lincoln persuades Leni to use a towelette, she also wears a green-and-white bathrobe with white towel on her head. Like the rest of her sisters, she later ends up wearing a potato sack due to the house's lack of power. Even her sunglasses have a missing lens.
When Pop-Pop wanted to video chat with his grandchildren, she dresses up like Lana to cover for her. When their parents found out about their little charade, their punishment was to go about their tasks while still dressed as the siblings they covered. She returned to the mall in her Lana disguise, but still had mud on her, and was denied entry.
In a flashback going back to when possums chewed up the house's wiring, she has her hair in an updo, and wears a 19th-century dress, long white gloves, a choker, and different red earrings, after reading a series of books about pioneers with her siblings.
Leni wears a pink coat, white ice skates, a green beanie, and red earrings.
Her sleep attire simply consists of a nightgown, which resembles her regular outfit, only sleeveless.
Leni wears a turquoise dress with an elevated skirt and a white waistband. She adds fringes near her chest and stripes on her skirt with material from Rita's Christmas tablecloth. She also wears red spherical ornaments as earrings.
Leni wears a dress made out of white tinsel. She wears a red bow at the waist area and wears red Christmas light bulbs as earrings.
In a flashback, Leni wears a swimsuit bearing a resemblance to her usual swimsuit, albeit without buttons, or a swim cap.
Leni's third Christmas outfit is made from the family's stockings.
On Christmas morning, Leni wears a pair of white high-heels that she got as a Christmas present.