Jane Seymour as the Princess Farah in Sinbad and the Eye of the Tiger. (1977)
There’s even a little bellydancing! The whole film (Shhh!) is listed here on youtube at:
And the bit of bellydancing is at 5:50. Aside from the annoying face veils, the bit of ‘chainmail’ thing going on at the belt, and the fascinator caps are pretty!
Seymour’s outfit isn’t much of a dancing costume, but it does have some very pretty elements, re: the coins, the shape of the choli top, etc.