This singlet is easy to knit. It is knitted back and forth. You need yarn (Online Linie 276 Sumaro. Worsted, 10 ply, 9 wpi. In small and medium you need 150 gram, 301,8 meters or 330 yards, in large you need 200 gram, 404 meters or 440 yards) and needles (8 mm/US 11). Three sizes: small, medium and large.