Swan Siblings' Sweaters

Once upon a time, you were a practising tailor living peacefully at the edge of the woods with your six siblings. Until the day a curse was unleashed upon them, turning each of them into mute swans and sending them adrift and afraid into the sky. When you find your siblings in the nearby kingdom, they inform you that the there is only one way to break their curse: you must create six sweaters for them and slide them over their necks to turn them back into human... and if a single word about the curse should spill from your mouth, all of your work will be lost and your siblings will remain swans forever...