A speaker addresses someone they love and compares that person to the sky. It's a short, quiet poem, and its whole point is steadiness. The sky is "eternal and navy," something that doesn't go away, and the speaker says that no matter how dark it gets, or how early the darkness comes, the loved one's blue is still there.
The feeling is devotion, and also comfort. The speaker seems to find something reliable in this person, a presence that holds through bad hours as well as good ones. The line "or how early" hints at moments when darkness arrives too soon, which could be read as hard times, though the poem never says so outright.
The final line, "your blue," is set apart and feels like a quiet claim of ownership and affection. The mood is calm, tender, and sure. The title, "Dazzling Silks," adds a sense of richness and shimmer, as if the blue were a fabric as well as a sky.