Dickinson wrote this around 1859-1862, when women's needlework wasn't just craft—it was coded communication. The colors you chose, the patterns you worked, the gifts you made: all carried meaning. When she picks cochineal for "thee" and something dusker for herself, she's not just describing thread. She's encoding a relationship into fabric.
Cochineal matters here. This wasn't cheap drugstore dye—it was made from crushed cochineal insects imported from Mexico, producing the most intense, expensive red available. It's what you'd use for something precious. The flamingo comparison isn't random: both flamingos and cochineal get their color from the same carotenoid compounds. Autumn is literally offering colors that would outshine nature's own pigments.
The repetition of the entire poem (it appears twice identically) has puzzled editors. Some think it's a copying error, but Dickinson often revised by recopying. This might be two drafts, or she might be making the repetition structural—like working the same pattern twice in knitting, once for each person.