I received this as a gift but it's already too small, so I'd like to give it away. (Although unused, it has been washed once.) Body: 85% cotton / 15% polyester Collar: 80% polyester / 20% cotton The following is quoted from the official website~~~~ This is a 2-way all-in-one with a collar featuring embroidered rocking horses and moons. The design is characterized by the three-dimensional, raised rocking horse motif. It's a versatile item that can be worn as pants or a dress depending on how you fasten the buttons at the crotch. The fabric has been treated to maintain a weakly acidic state. #CeremonyDress #HospitalDischargeOutfit #Romper