- Capsule HARRY POTTER - Two-material navy blue skirt for girl - Top: tulle petticoat, skirt bottom cut-out for volume - Bottom: Harry Potter check print lining - Elasticated waist, striped - Flared shape, length over the knee The tulle petticoat? She loves it already. The real twist is the printed lining, which you don't need a spell to decipher. A must-have for Harry Potter fans.