There are many exceptions in later periods, the famous ones are kobai (light pink) Noshi which was worn by FUJIWARA no Tadanazain the period of the cloistered governments and also worn by ASHIKAGA Yoshimochi and his favorite Noshi in early Muromachi period.
それ以後の時代にも特例はおおくあるが、院政期の藤原忠実、室町初期の足利義持が愛用した紅梅直衣が有名。