This square is made in three parts using Scheepjes Aquarel and a 4 mm Clover Amour crochet hook (US G/6 UK 8). Using this hook and yarn, the final square is 17″ (42 cm). If you use worsted weight and a 5.5 mm crochet hook, your square should be 24″ or more (depending on your personal gauge). I have seen some truly GIANT ones!! A link to that pattern on Ravelry.com you will find below. Free pattern of Charlotte – Large Square you will also find below.