In general, 70-degree weather calls for shorts or pants with a light top. For people more sensitive to cold weather, a long-sleeved top in a lightweight fabric is a good choice. If the temperature is expected to drop in the evening, carry a sweater or light jacket.
Temperatures around 70 degrees often indicate spring weather in many parts of the United States. Pair an undershirt with a cardigan to regulate body temperature if the wind makes things chilly or the temperature rises. Pair dresses with a denim or suede jacket to provide added warmth if necessary.