In early May, Grace Kelly went to Cannes France for the 8th Cannes Festival, the editor of Paris Match Pierre Galante, then husband of American actress Olivia de Havilland, suggested that Grace Kelly have a photo shoot in the Prince's Palace of Monaco(Palais princier, Monaco) then a meeting with Prince Rainier III. Grace Kelly was reluctant at the beginning, but she decided to say yes.

On 6 May 1955, after some difficult start and the late arrival of Prince Rainier of Monaco, Grace Kelly finally met him, they took a walk around in the palace, then Grace Kelly left for her other engagement.

For the meeting, Grace Kelly wore a square necked floral dress with long sleeves and drop waist.

About 7 month later in January 1956, Grace Kelly and Prince Rainier of Monaco announced their engagement publicly, and three months after the engagement, on 19 April 1956, the couple were married in St. Nicolas Cathedral, Monaco.

The floral dress Grace Kelly wore on 6 May 1955 thus became the most symbolic dress in connection with her future as Princess of Monaco.

It is a taffeta dress of long sleeves with floral print, featuring square neckline and drop waist, it was designed by McCall Patterns for Grace Kelly, who appeared on the company's Spring patternbook of 1955.

Whether sleeveless or long sleeved, black, or white, or cream colored, Grace Kelly knows how to wear her turtleneck sweaters. She wears it alone, inside an open jacket or a loose fit sweater, letting the turtleneck in solid color framing her delicate face features and slim body. No embellishments, just solid color and simple silhouettes.

Her favorite turtleneck sweater is the Aran turtleneck, the Irish turtleneck sweater with intricate cable knit originally made for sheep farmers and fishermen. She wears it for boating in summer, and skiing in winter, pairing with a pair of fitting tapered pants.  For those sheep farmers and fishermen living on the small islands of 
Calway Bay on Ireland's west coast, where the Aran sweater came from, Grace Kelly in their sweater must look like a goddess wearing their creations, blessing their livelihood, which she did. Grace Kelly, as well as Alain Delon, makes Aran turtleneck sweater a staple in the wardrobes of those style conscious people all around the world, even decades later.

In the film The Country Girl(1954) Grace Kelly played Georgie, a long suffering wife of an alcoholic actor, as her character started to lose illusion of future and desire of being beautiful, her outfits changed as well, and one of them was a cardigan sweater, a sort of granny styled cardigan: cable knit, long, slightly oversized, with cheap-looking plastical buttons.

In her another film Dial M for Murder(1954) released the same month of the same year, Grace Kelly as wealthy socialite Margot also wore an cardigan sweater: cashmere, fine knit, pastel pink, embroidered, and fitting.

And that is how Grace Kelly wore a cardigan sweater in her life, most of the times: fitting, fine knit, lightweight, the discreet pastel colors, mostly cashmere. And her favorite brand, is Pringle of Scotland, which makes cashmere cardigans for Queen of England every year.

Grace Kelly wore her cardigan above a shirt, a blouse, a dress, or wears it alone, tucking into her skirt, or simply just throws it on her shoulders, always looking effortlessly elegant. Even after becoming a mother, Grace Kelly loved wearing cardigan, celebrating her first baby Caroline’s birth wearing one and knitting another for the new born princess.