Boy in Polish costume

Netscher, a Dutch painter, was a popular portraitist of court circles.
He specialized in small-scale portraits in which he carefully reproduced the rich
and elegant outfits of their models. A portrait of a boy in Polish costume in Puławy was considered the portrait of Prince Zygmunt Kazimierz, son of King Władysław IV and Cecylia Renata, who died at the age of 8. However, this definition of character seems unlikely. Comparison with other known and preserved performances of the prince shows no similarity.
The boy on the Krakow portrait of Netscher could have been a child of a Polish diplomat
in The Hague or only a model dressed in an polish outfit that is exotic for the Dutch.