wear a red coat（动词短语）例如：He often wears a red coat to school. 他常常穿一件红大衣去学校. in a red coat （介词短语） 例如：The man in a red coat is from my hometown. 那个穿红大衣的男的来自于我的家乡. He is in a red coat now. 他现在穿着一件红大衣. be dressed in + 颜色、衣服（固定短语） 例如： She was dressed in a red coat. 她穿一件红色的衣服
