Way back when, I made Linnea a classical plain white regency dress out of white gauze. Some time after I took a look at it, decided that I wasn't interested in that dress anymore, so I took it apart.
I had it in my head to make more pretty high waisted outfits, but with a bit more historical accuracy. To make the dress hang right, I would make a petticoat. The dress in question would be a wrap front day gown to be topped shawls, spencers, fichus and caps. The petticoat was cut down from Linnea's old dress and given a bit of trim just for fun. The dress was also lightly trimmed, as I didn't think it needed much.
I had good fun embroidering the fichu, which was simple chain stitch and French knots. The shawls I made were long rectangles with fringe (though I made up the patterns off the top of my head rather than research them.) The cap pattern and trim line I took from the Regency Fashion Page. I have no pictures of the spencer, as it was a tough too small to fit over the dress, though it does well over sleeveless tops.