Size 16 advice normally wear inner 11.5cm.
Size 17 advice normally wear inner 12cm.
Size 18 advice normally wear inner 12.5cm.
Size 19 advice normally wear inner 13cm.
Size 20 advice normally wear inner 13.5cm.
Size 21 advice normally wear inner 14cm.
Size 22 advice normally wear inner 14.5cm.
Size 23 advice normally wear inner 15cm.