Delicate colors, such as those of the suit in the photo, are often associated with femininity. Diana's choice of these colors may have been a way to create a gentle and sweet image, especially given her role as a public figure and member of the royal family. The delicate colors that Lady Di loved so much have always been and most likely will be in trend. Diana's fashion often gravitated towards classic and elegant styles, and delicate colors could work well with this aesthetic.

@Princess Diana Photo Collection Part 21 – 1997/ Women of History/YouTube.com