"As someone whose husband has served, I know how hard it feels when a loved one leaves to do the job they trained for", she said.
Tragic Henry was close friends with both the royal princes and was killed in a auto crash when he was 18.
Prince Harry and Meghan Markle were not among the attendees at the ultra-formal event, but they had a good excuse.
Sqn Ldr Waghorn, 34, whose 80-year-old father David Waghorn had met the royals at their Christmas Party, said: "They said their parcel service "really was royal mail". The couple should be living at Frogmore Cottage in Windsor ahead of Meghan giving birth and could choose a hospital near there.
Kensington Palace have issued a strongly-worded denial, but it might be an uphill battle for Meghan to win back that same level of public affection.
The "royal fab four" will no longer be living at Kensington Palace together at the beginning of next year.
"It would be a real shame to Harry and William if their wives don't get on, but it's quite a big leap of speculation", says Duncan.
And the wide-legged style is her particular favourite, worn on multiple occasions since she took up royal duties a year ago.