my very first instinct was early 15thC Italian with the sleeves a different colour to the body. So it could have been painted later to reflect that style.
I have seen some gowns that look like an over dress over an under that shows the sleeves of the under... but they generally are of the same colour and the outer gown has long hanging sleeves.
There is a painting by Holbein the elder with a woman in a sleeveless over gown with brightly patterned undersleeves and skirt. I'm not sure if I have seen a good copy online, but I do have it in a magazine of the great artists. The front of the gown is quite different to the sculpyure though. http://www.bildindex.de/bilder/MI03420a02a.jpg Clearly she's in a religious context so the sleeveless gown could be a signifier?
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I have seen some gowns that look like an over dress over an under that shows the sleeves of the under... but they generally are of the same colour and the outer gown has long hanging sleeves.
There is a painting by Holbein the elder with a woman in a sleeveless over gown with brightly patterned undersleeves and skirt. I'm not sure if I have seen a good copy online, but I do have it in a magazine of the great artists. The front of the gown is quite different to the sculpyure though.
http://www.bildindex.de/bilder/MI03420a02a.jpg
Clearly she's in a religious context so the sleeveless gown could be a signifier?