Several of you are costume historians or historical costumers. Others of you are consummately interested in the details of the past.
I'm hoping you can help date this painting on the basis of the clothing styles therein - the more precisely, the better. A specific year would be miraculous. This is for my mother. She's particularly interested in possible dating for the jacket.
If only this were medieval, I'd have even greater confidence in your abilities, but hopefully you can, nevertheless, help.
Here's the clothing (and the person wearing it).