This image is of Charles I's five eldest children in 1637, as I could not find an image of Hélène's family, this is around the same time period and probably similar to how her noble family would have dressed. While we know that Hélène definitely had a younger brother, Eustache, the other sibling genders are unknown. Her siblings would have been dressed in similar style to the ones in this photo. Little boys and girls would dress similarly to adults. In 1629 and 1633 Louis Xlll of France tried to simplify clothing by prohibiting lace, gold trim, and lavish embridery for all expect the highest noblilities. (Kõhler, Carl: A History of Costume, p. 289)