This summer, you'll love working with lace, and so will your crochet! Play with stitches and chains to create this little summer gem with this crochet sweater pattern using natural pure cotton PHIL COTON 3 yarn, in sailor blue. To make this design, you will need: Crochet hook size 3.5mm. This expert level pattern is available in the following sizes: 34/36, 38/40, 42/44, 46/48, 50/52.