Sweat-wicking T-shirt + long-sleeve shirt for warmth + jacket on top.
Long trousers or leggings.
If the weather gets colder, you might want to add a beanie and gloves.
Wear all layers to stay warm on your way to/from the park. During your workout, remove top layers one by one if you get too hot.
Use sweat-wicking materials for comfort. Avoid simple cotton shirts as they can get wet and make you feel cold.