US$ 23.80
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Description
Fabric: Stretch Tulle, Sequins, Faux Feathers, Polyester

A pink floral silk shirt dress designed by Walker, which Diana wore to Prince William's sports day at Richmond Stadium in 1988 as well as leaving Prince Harry's school in Notting Hill in 1992, sold for $444,500 (352,000)

53.5" long
I found this affordable dupe at Coast

Pippa Middletons red accessories also took style notes from her older sister as she chose to wear the 395 Natasha clutch by Emmy London in candy and matching red 445 Emmy London Rebecca heels