Despite the only currently and readily available images being in black and white it is fairly easy to at least recognise the gown as being a cloth of gold. Most likely red and gold. This is of the type of cloth of gold seen in the Margareta gown of the 15th C.
Her gown is open at the front, like most gowns of this time and place, with half length sleeves and semi fitted paned sleeves beneath.
Her gown scoops in front revealing a dark toned filling piece, and her undergown appears to match.
Her cap shows a little shaping at the nape of the neck but otherwise is recognisable as of the region. There is a wide strip at the front of her headdress that appears to go under the cap which is not typical of other pictorial representations.
She appears to have a close fitting gold/goldwork collar around her throat with a round pendant on a narrow chain and then a broad gold chain for jewelry.