This look has not been in style for 135 year or so, and I have yet to find a close substitute in a thrift shop. You are just going to have to make one. We will assume that this is your first garment and you need it fast for an upcoming reenactment. To make this as painless as possible, plan to construct a rather simply designed, functional dress or wrapper. Every woman needs one of these in her campaign trunk, so start with it since it will be the quickest to construct.
Some women create a dual purpose garment - a skirt with two bodices.
One bodice is plain for day use. The other bodice, more fancy, for balls or parties. This saves money on fabric, as the skirt uses about 5 yards of fabric. Make your garment in a solid color fabric. Or at least a simple plaid or stripe.