The basic characters were penpals. Then, they finally decided to meet each other.
They agreed to wear specific colors of clothes on their meeting days that they may recognize each other. I think the lady wore green with arose/corsage near the chest.
The man was disappointed to locate an old lady wearing exactly that. But the man still approached the old lady. The old lady told the man that SOME BEAUTIFUL WOMAN told her to wear those. The old lady said that the BEAUTIFUL WOMAN would wait at the cafeteria or something...
DO you like a short story like this? What was its title?