Penguin sweater

Penguin sweaters, also known as penguin jumpers, are sweaters knitted for penguins that have been caught in oil slicks. When an oil spill affects penguins they have in the past been sometimes dressed in knitted sweaters, supposedly to stop them from poisoning themselves by ingesting the oil during preening, and to keep them warm, since the spilled oil destroys their natural oils. The sweaters are removed and discarded as soon as the penguins can be washed.

This keyword could refer to multiple things. Here are some suggestions: