I couldn't come up with a clever title, so I just went with exactly what it is: Panty and Stocking (from the 'Panty and Stocking' anime) dressed up as Nami and Robin (from 'One Piece'). This was from a suggestion from
when I asked for Halloween crossover fandom ideas. His other idea is to have Nami and Robin dressed as Panty and Stocking, which may still happen. Enjoy this for now!