Unless you live in perpetual summer, a coat is your best friend when the temperature dips. What style do you prefer? Is it clean cut double breasted coat, a cozy blanket coat or a trendy cape?
If you're looking for a thrifty option, your best bet is this J.Crew Coat. It's a great item, while not very pricey. In this price range, you can also consider this J.Crew Cape Coat. It's also a popular item and won't break the bank.