I will write more about this when I make the web page on this dress, but in general there are two types of bliauts, those which only have gores (very common in german, english and scandinavian art) and those who appear to have a pleated attached skirt (only french as far as I know). The latter method is under debate, but I think Janet Snyder has proved that it is at least the most plausible construction method for some of the bliauts seen in french art, in her article in Koslin and Snyder ed. Encountering medieval textiles and dress : objects, texts, images (New York 2002).
More will come on this subject when I get the time to write about it and work on the photos.

Eva

Eva