Ending today, J.Crew offers its J.Crew Women's Arabelle Long Dress in Silk Chiffon in 10 colors (Bright Coral pictured) for $199.99. Coupon code "TIMETOSHOP" cuts it to $99.99. With free shipping, that's $265 off list and the lowest total price we could find. It's available in regular and petite sizes 00 to 20, although not in all size/color combinations.
Wear a petite size 4 or 10? It's available in Soft Peach or Parisian Yellow for $189.99 before coupon, $94.99 after.