I am glad to see someone bring up this subject, but I didn’t get the impression that Nureyev’s comment was concerning modern dance costumes. It seemed to me to apply to costumes in classical ballet that were not moving with the dancer as they should.
It is a great distraction for me to see a dancer pirouette or leap with a bunch of underskirt clinging between her legs. I imagine that it is distracting to her as well. One of the beauties of a longer full skirt is the twirl of it. Every woman who puts one on tries it out, so surely the dancers and wardrobe must be aware of the problem. After all, they do have dress rehearsals as well.
In Danilova’s book, Choura, she mentions that the costume maker, Karinska inserted horsehair in the hems of her costumes to prevent them from clinging. Surely there is something in this technical age to easily and cheaply remedy this problem. Sometimes it appears that the skirt has not been gathered evenly and there is more on one hip than the other. Or perhaps the material is wrong and it sticks to their tights. Whatever the cause, it could be fixed easily by the wardrobe people.
I have noticed this on my DVD’s from the 80’s to the latest ones in almost every ballet where long skirts are worn, regardless of the expense of the production. It happens to the corps members and the soloists alike. I would much rather look at what the dancer is doing with her legs than what her costume is doing to them.