I saw this painting and instantly thought...11th doctor riding habit. If you changed the jacket to tweed and the hat is quite fez-ish.
I think the above is more achievable for me for now. The hat is blue felt decorated with grey netting and a few 'clockface' buttons. The jacket is blue velvet (from my shop bought wardrobe). The shirt is the one I made for my 8th doctor cosplay, removable collar so I could have it wing or collarless. The skirt is a blue wool blend. The boots are riding type boots.