Wear your summer dresses during fall too. Just add a denim jacket and a scarf and change your sandals with boots. This is classic for me; little black dress with jean jacket to casual it down and tall boots, all in my colors :)
Love the polka dot top and cardigan. The color of the cardigan (burgundy?) is beautiful. I like the color of the pant but would want a straight or skinny fit work appropriate pant (think Limited's Exact Stretch Skinnies).