Bought in Venice, never worn. More than $160 new. From their website:

The Modigliani velvet Friulane is the slipper that started everything — the original silhouette born at Venice's Rialto Bridge in 1952, and still the truest expression of what Piedaterre stands for. More than seven decades later, this founding design remains the heart of the collection: a rounded toe, a gently curved neckline covering one-third of the upper foot, and a closed heel that wraps the foot with quiet assurance. Where other brands have chased trends, the Modigliani has simply endured, proof that the most compelling designs are those that never needed reinventing.
The upper is cut from 100% natural cotton velvet, a fabric chosen not for spectacle but for substance — its soft pile yields a depth of color and tactile warmth that synthetic alternatives cannot approach. Matching grosgrain ribbon traces each seam with the restraint of fine tailoring, while a small Venetian glass pearl, hand-applied to the outer side, anchors every pair in the centuries-old Murano glassmaking tradition. Inside, a cotton lining breathes naturally against the skin. The closed heel provides a sense of completeness that sets the Modigliani apart from open-back styles like the Dandy, making it equally suited to brisk autumn walks and unhurried summer evenings.