This lady wears a white and gold dress similar to that worn by Marchesa Giovanna Cattaneo in her portrait from the same time, also by van Dyck.
This comes close to being a duplicate of the last image, except she wears a deeply-goffered ruff and matching cuffs. It is very unlikely that her skirt was supported by a farthingale.
Keywords: 1622, van Dyck, Italian, high enclosing neckline, ruff, basque bodice, saya, hanging sleeves, cuffs, false sleeves, long puffed sleeves, full skirt