Mid 1860's Brown Plaid Dress

From the seller:

An enchanting 1860’s Civil War era taupe plaid silk dress. The fabric has a white and beige plaid pattern on a taupe background. The background fabric has a tiny dot pattern. The yoke and sleeve cuffs are trimmed with self-fabric pleated ruffles. The armscyes and waist are piped. The bodice and skirt are lined with cotton. The bodice has a front mother of pearl button closure. The dress is in very good and sturdy condition. There is some minor underarm discoloration and 1 inch split under one arm near the seam that will need minor re-stitching. The lining inside the bodice is splitting. (See photo.). The age flaws are not visible when displayed. A lovely display ONLY dress. Bust 34 Waist 26 Skirt length 39 Width at hemline 148.

From Me:

I'm thinking about 1864/1865 based on the waistline and trim placement.