Ok so I have said this before but I work in fashion and specialize in dresses... One of the HOTTEST trends right now is tie dye, ombre effects and dip dying which all look similar to Gwens dress, The best part is it ranges from expensive gowns to sundresses. So I am sure you will find one you love. Try brands like OC by Oleg Cassini, Donna Morgan, Zum Zum, Niki, Nightway, Adian, Niteline, Nordstrom and Lord and Taylor should have this style available