In March 2011 June I published the article:
showing a picture of a Norbertine with a very tall white biretta.
Portrait of Cardinal Benedict Blommaerts (I don't think he was a cardinal?)
half-length turned to the left, facing towards the viewer; wearing a biretta, mozzetta and a rochet in his hands he holds a necklace with cross; after Jacobus van Reesbroeck; 1635-1704 (c.)
Very tall cardinal's biretta