Originally Posted by
Enkidoh
Well, we already have several long dresses... but they're more old-fashioned in style (there's the late 1700's Riviera Dress for one, the Regency-era inspired Spring Dress and Skirt, the late Victorian era inspired Rainbow Bustle/High House Bustle... and the three wedding dresses).
Sadly, nothing that looks like the dress shown in that link you posted exists in the game, but, the Spring Skirt matched with.. say... the miqo'te chemise dyed Pure White might be closest to a more modern sheer length gown.