Russian Sarafan - It is a pinafore-like dress that hangs from under the arms down to the ankles. It used to be worn by women in Russia. It might have been derived from the panjova, another Russian garment.
Russian sarafan, as the person whom I pinned this from said, it's out of period, but still lovely. According to this source: it's a Sarafan from the province of Tver.-- Reference for Princess of Russia