Highgrove House: 1986 Diana frequented her country house in Highgrove with Prince Charles, although she reportedly compared being there with him to "prison." On this visit, she's wearing a pair of pink gingham pants (a pattern that's very trendy at the moment) and a hot pink matching sweater (or, jumper, as they might say in the U.K.) Guard's Polo Club: 1988 There are a few of Princess Diana's outfits that are in constant circulation on the internet, due in part to their unachievably casual vibe
orange dress with floral pattern via here 50
Removable belt
This white maxi has a similar tiered shape, but the thin straps and cut out details give it a beauty, boho vibe
This one is from a doll called Alyssa Bride, and was designed by Jason Wu: Alyssa is from 2020, so her dress is more modern than most of the things I've looked at in this series
For cooler evenings, drape a lightweight pashmina in a tonal shade over your shoulders for an extra layer that still photographs well and keeps you warm during the outdoor portion of the reception