When is comes to transitioning to cooler weather, a poncho or shawl is a great choice. Amazon has a huge selection of ponchos and shawls, including this Batwing Knitted Poncho with Fringe for $15.88.
Other colors are available. Be sure to check the measurements given since this comes in only one size.
(I love the convenience of shopping online and I think you will too. The links in this post are my referral links. Read my disclosure policy here.)