It was around 1924, when Fr George Preca was praying in front of the titular painting of the Immaculate Conception at Cospicua Parish Church (Malta). The painting, shows the Immaculate Conception of Mary, with Mary depicted as a young lady dressed in white, being crowned by God the Father and surrounded by angels. It was painted in 1828 by a local painter – Peter Paul Caruana. The devotion to this painting lead to the crowning of the image on 25 June 1905 by Cardinal Domenico Ferrata, during the reign of St Piux X.
Some members noted that Fr Preca spent more time than usual praying in front of the image. They interrupted him as it was time for him to start a talk. However, he told them that he was inspired to write a litany, to teach it to the members so that they could recite it (and sing it) in front of the image of the Immaculate Conception.
The Robe of Honor in Latin Vestis Honoris is a litany to Our Lady, where St George Preca honors her as Queen (in original text he uses the word Sinjura – which translates to Your Ladyship) of all creation. This prayer is sung every 7, 17 and 27 of each month in all the SDC Centres.
This video can help you with your medidation. (text in Maltese)