From the seller:
A captivating 1860’s teal blue and tan stripe open weave cotton dress. It can honestly be said that the photos do not do this dress justice, it is much prettier in person. The color shows best on the close of the sleeve and the close up photo of the back of the bodice. The bodice has full pagoda style sleeves and a short cap over sleeve. The sleeves are trimmed with baby blue silk ribbon. The ribbon has a pink floral pattern. The neck, armscyes and waist are piped. The bodice is lined with cotton and has a front hook and eye closure. The skirt is attached to the waist with tight cartridge pleating. The skirt is lined with a plain cotton petticoat. The dress is in very good and sturdy condition. There is mild underarm discoloration and some stress wear under the arms. There are a couple of very small stress marks on one shoulder. The skirt has a few scattered tiny holes and one period patch mend that is only visible on close inspection. Bust 36 Waist 30 Skirt length 42 Width at hemline 140
Probably about 1863 based on the sleeve and waistline. By that point, you start to see the pagoda sleeve have strange details - like this indent- and the pointed waistline pretty much completely disappears for daytime wear. By 1864, the pagoda sleeves are pretty much gone from fashion.