Don't forget a hat and gloves, and at least a few pairs of wool socks. A good solution for both cold and precipitation is an oversized jacket with lightweight lining, under which you can wear many or few layers, depending on the temperature. Remember that packages received in September may be delayed considerably, so you might want to postpone shipment of garments you will not need immediately. In April and May the weather should start to be sunny and warm again. Many years have shown us dreary days interspersed with sunny ones.
Autumn clothing is often suitable in the spring as well.