When a gust of wind blows someones skirt up and they have to hold it down. Like Marilyn Monroe's famous scene in 'The Seven Year Itch'
(gust of wind)
She may have been wearing a knee-length coat, but the Duchess perhaps didn't anticipate just how windy it would that day. She gave onlookers an eyeful when a gust of wind ensured her very own Marilyn moment. Whilst exiting the aircraft she was forced to quickly pull down her dress and as it almost resulted in a rather embarrassing knicker flash.