Alexandra Kerry is the elder daughter of former Massachusetts Senator, 2004 US Democratic presidential nominee and current U.S. Secretary of State John Kerry. Her late mother was Julia Thorne, who was married to John Kerry from 1970 until their divorce in 1988. Alexandra has a younger sister, Vanessa Kerry.
There are undergarments available for see through dresses, and I would have thought the etiquette police would have notified the Kerry daughters.