Where to buy prom dresses in Barnstable, Massachusetts The boutique that has the BEST prom dresses in Massachusetts. Bettyonce's Boutique Inside South Shore Plaza Mall in Braintree Mall 2nd Floor above Target, across from The North Face Amari Prom Leely Women Ivory Flower Embroidered Long Corset Prom Dress with Slit Strapless Sweetheart Party Dress Prom Dresses in Massachusetts Alexandra's Boutique Blush Pink Satin Strapless Illusion Corset Rhinestones Slit Prom Dress