The change of leaf color is a reminder to also change over our wardrobe — airy tops and dresses make way for chunky sweaters and cardigans. Until a random 75-degree day sends us reaching for those airy tops once again. With such unpredictable temperatures, there is a formula to consider when getting dressed, and layering is key. Here, the Tory Daily editors pulled together three looks that fit the bill for fall — pleated skirts and laidback slacks; lightweight cardigans and Fair Isle knits; over-the-knee boots and classic loafers…