Generally, Ihram are those 2 pieces of cloth, which a Muhrim or Haji use, one as a lower garment and one as an upper garment. After the (Ghusl) bath, one cloth should be draped on the upper body and the other should be used as a garment for a lower body.
It is Afdhal (superior) if the cloths of the Ihram are new, but used Ihram can also be used after washing them. As given in Fatawa A’alamgiri, Kitabul Manasik.