OTTAWA: The blue silk velvet dress Princess Diana wore at a 1985 White House dinner and famously danced in with actor John Travolta will be offered for sale along with other gowns, a Canadian auction house said Tuesday. Waddington's auction house has scheduled a sale June 23 for 14 gowns selected or commissioned by the Princess of Wales between 1985 and 1994 from British designers Catherine Walker, Bruce Oldfield and Zandra Rhodes. Florida entrepreneur Maureen Rorech Dunkel reportedly paid $700,000 in 1997 for the silk, satin, velvet and embroidered formal dinner and evening dresses at an auction to raise money for Diana's humanitarian causes.