In our life, there are always many loving couples around us, and the depth of their feelings is obvious to all. But in daily life, they don't wear matching clothes, but wear clothes they like. Maybe they don't have matching clothes, but their feelings are still very good and love is sweet, so couples who wear matching clothes are not necessarily sweet and happy, nor are those who don't wear matching clothes.
When two people look at each other's feelings together, they feel very in place, so they can hit it off and come together smoothly. If the feelings are not in place, then it is futile to try to repair them anyway. Sweet love requires two people to run together. Two people need to understand and communicate with each other when they meet something. Nowadays, there are too many couples who break up in the society, most of which are caused by the lack of communication between two people, so it is not just as simple as two people wearing lovers' clothes to get sweet love.
So in general, two people in love are not necessarily sweet and loving, but they are not wearing lovers' clothes, and their love is not necessarily not sweet. Being together is just a way to enhance feelings. Wearing the same clothes makes them closer and shows their intimate relationship in front of outsiders.