BREAKING News: This has been identified as having been in a French auction many years ago, thus making the odds of it being French very, very good.
The use of the stripe sideways on the stomacher really emphasizes the vertical stripe on the robings. It is also easy to see how the robings start to angle over the shoulder with this stripe.
Simple back pleats cleverly using the stripe in the folds. A sweet gown. You can also see a bound hem around the bottom of the petticoat. I wish there were interior details. This would be lovely to examine in person. Right now the date of the auction is not set. A possible road trip to see it.