My friend just introduced me to the OMG Dress by Ximena Valero. This dress is amazing. You can wear it in a million different ways and all of them look good!
Buy the dress here: Ximena Valero | Official Online Store » Shop » Catalog Products » OMG Dress
Or buy a similar (and much cheaper) dress at American Apparel: Cotton Spandex Jersey Bandeau Dress