Theresia Vreugdenhil (18 August 1929 - 11 July 2012) was a Dutch female tailor (couturière) and fashion designer. She often worked with patterns of French and Italian couturiers.
From 1965 till 2007 she was the only official couturière of Dutch princess and later Queen Beatrix. In high degree Vreugdenhill was co-responsible for the strong and very recognisable silhouette of Beatrix
Perhaps you should need persons like Vreugdenhil again.
I believe Anne Marie of Greece has (or had) a personal dressmaker. Her evening style hasn't really changed in years, and her dresses always work well with her figure.