Я читала без словаря, там в контексте было слово "dress". Я сама удивилась, отыщу цитату, посмотрим. Может быть, это что-то другое. Типа оперение так назвали

Барбосса звал птичку "маленькая Полли".
Добавлено спустя 13 минут 14 секунд:
Все! Дело в том, что там Барбосса говорил о попугае, которого звал Полли, но потом у него появилась обезьянка. Он тоже назвал ее Полли. На корабль Гектора нападали и...
[spoiler="Из книги"]
“Who is this Polly?” Mistress Chin demanded. “Your doxy?”
Barbossa looked rather shocked. “Course not, ma’am. ’Tis bad luck to be bringing a woman aboard a ship. Polly ain’t—warn’t—human.”
“Polly, that is the English name of a parrot,” Villanueva observed.
“I did have a parrot named Polly once,” Barbossa admitted. “A fine bird he was, but he messed up the shoulder of me jacket.” Jack saw the hint of something that might have been sardonic humor flash across his features, and realized Barbossa was indulging in a bit of irony. The grizzled pirate sighed theatrically. “But the Polly I lost after the battle was me little monkey. Pretty little thing, she was. Understood every word I said to her.”
"I was in the water, no boat within reach. Me poor Polly had been holdin’ on to me shoulder. She was wearin’ her little blue dress, but suddenly she wasn’t there and I couldn’t see her. I swam under, gropin’ through the water and the wreckage, tryin’ to find her, but she was gone".
[/spoiler]