Moon: chain 20. Working in rows: sc across, increasing at each end every other row until the piece is 8 cm wide at its widest point, about 6 rows. Then decrease at one end only (the inner curve of the crescent) for 4 rows while continuing straight on the outer edge. The crescent shape is fiddly to describe but obvious when you do it: the outer edge stays wide and the inner edge curves in. Fasten off and weave in tails.
Stars (make 3): chain 4, slip stitch to form a ring. Round 1: 10 sc into the ring. [10]. Round 2: (sc, chain 3, skip 1) 5 times, slip stitch to join. [5 chain-3 points]. Round 3: into each chain-3 space work (sc, hdc, dc, hdc, sc) to create 5 filled points. Slip stitch to join. Fasten off.
Block all pieces: pin the moon flat on the blocking mat, stretching the outer curve gently. Pin the star points out. Lay a damp cloth over everything and press lightly with a warm iron on the cotton setting, or simply leave the damp cloth on for 20 minutes without heat. Let dry completely.
Thread the cord through the top of the moon and two stars. Tie the third star as a pendant below the moon on a short 10 cm length of cord. Knot the main cord at each end for hanging loops.