Buy a bigger one. Jacket is a kind of functional clothing, which is usually made of waterproof and breathable fabrics, such as polyester fiber and nylon. If the coat is too tight, it will limit the air flow inside the clothes and greatly reduce the warmth. If you buy a bigger one, you can ensure that there is enough space for air circulation inside the clothes, thus improving warmth and wearing comfort. Secondly, if the coat is too tight, it will limit the range of activities of the body and it will be very uncomfortable to wear. Buying a bigger one can ensure that the body has enough room to move and it is more comfortable to wear. Therefore, it is recommended to buy a larger women's coat.