Advanced skills. You need yarn (Madelinetosh tosh merino light, La Drogueria Surnaturelle or Mandarin Petit, all Fingering, 4 ply, 14 wpi. 250 grams, 975 yards or 890 meters for small, 300 grams, 1170 yards or 1068 meters for large, or 350 grams, 1365 yards or 1246 meters for X-large), needles (3,5 mm or US 4). You also need either buttons, zipper, snaps or claps. Knitted back and forth. Three sizes: small to medium, large, and X-large to XX-large.