Thandie Newton, lithe and long-limbed

There must be more purpose to this daring getup than providing a gratuitous display of perfectly toned legs. Perhaps she needs the freedom of movement to perform a complicated floor routine that will involve many jumps and split leaps? And maybe the missing strips of her dress will make an appearance during the ribbon twirling segment of the competition?
That Onesie is really stretched out in the bum. She must have lost a lot of weight.