Evening Slippers: 1835-45, American (probably), silk. "In the first three decades of the 19th century, evening slippers were often worn in both bright and pastel colors...The grass green of this pair of shoes was one of the few bright colors which persisted for evening wear into the 1840s, albeit a distant third behind white and black...Although this basic form remained the standard ..for over fifty years, one can see the distinctive wide square toe commonly worn around 1840 in this example."
3. Directoire and Empire Period Costume for Women. This is a pair of silk evening slippers that tied around the ankle. Some lacings went all the way up to the knee.
Historical Fashion #4- Evening slippers..
Silk evening slippers - American - 1835 to 1845 - Metropolitan Museum of Art