Answer:
Winter: a thick pair of wool socks with laced boots, leggings underneath a pair of jeans, and a long sleeve shirt underneath a jacket. (If outside, then a big coat over top)
Summer: strappable sandals, shorts, and a short sleeve t-shirt. (If outside, a hat to protect baby's head) (sunscreen included)
Winter (reason): plenty layers of clothes will keep them warm and protected from the cold.
Summer (reason): putting them in less clothing but still a reasonable amount will keep them from getting overheated and protected from the sun using sunscreen.