Waist 70 cm is 2 feet 1, size 28, calculation steps 70/33.33 = 2.1 feet, 2.1 * 10 = 21, 21 + 7 = 28 yards. 26 yards = 1.9 feet waist, 27 yards = 2 feet waist, 28 yards = 2.1 feet waist, 29 yards = 2.2 feet waist, 30 yards = 2.3 feet waist, 31 yards = 2.4 feet waist, 2 yards = 2.5 feet waist, 33 yards = 2.6 feet waist, 34 yards = 2.7 feet waist, 36 yards = 2.8 feet waist, 40 yards = 3.0 feet waist. foot waist, 34 yards = 2.7 foot waist, 36 yards = 2.8 foot waist, 38 yards = 2.9 foot waist, and 40 yards = 3.0 foot waist.