The Draped Flutter Dress from Forever21 is $24.80, and would look great with the Infinity Cardigan at j.crew for only $39.99 (on sale from $89.50). Pair this up with the Havanna boots at bakershoes.com for $59.99. Also, add a sexy piece of jewelry such as the Coral Reef Earrings $23 from NYmetals on Etsy.
The cardigan and the boots are especially a great versatile find, as they will last you a few seasons and can be paired up with any outfit.

Forever21.com Draped Flutter Dress $24.80
Infinity Cardigan $39.99 from $89.50
Coral Reef Earnings Etsy $23all photo are from etsy.com, jcrew.com, forever21.com, and bakershoes.com