5 mm (DK/light worsted). One size fits all.
Pattern was designed using Sport+ yarn, which is a 50/50% wool and acrylic blend. A sample of 10x10 cm knitted with 5 mm needles will yield 16 stitches and 20 rows. One 50 g skein of this yarn measures 80 meters.
Original pattern used 18 skeins.
This pattern is free with registration at Bergère de France website.