Difference Between In and On with Comparison Chart Key outfit of the night heart importance is a phrase used to depict a attire that is worn in the night or for special occasions. Heart represents love, emotion, and affection. Therefore, an ootn showcases a fashionable and alluring outfit that reflects the affection for fashion and enjoys the evening vibe. Sporting an ootn can boost your confidence, make a statement, and exude sophistication and charisma. Whether it's an glamorous dress or a chic suit, the ootn ensures that you catch everyone's attention and make a memorable impact at any night event.