Sorry did I mess up times and Queen?
Wilhelmina was queen from 1890 untill 1948, when she abdicated in favor of her daughter Juliana. In 1962 Wilhelmina passed away.
Juliana was queen from 1948 untill 1980, when she abdicated in favor of her eldest daughter Beatrix. In 2004 Juliana passed away.
What I have seen of Wilhelmina she was often dressed in simple colours and styles (in her later years often looking like a big block concrite). While I can remember seeing Juliana in those 60/70 ties inspired dresses and dessigns. Also often with turban, so perhaps she also inspired Máxima.