When Sarah is accidentally caught in the hibernation process, she is wearing a blue flowery dress. When Harry finds her in one of the hibernation compartments, she is wearing one of the "futuristic" suits. But there was nobody awake who could have changed her outfit.
When the Doctor and Harry first discover the room full of cryogenically frozen humans, there is a point where the two of them are talking and, from over Harry's shoulder, you can see one of the "frozen" humans opening and closing his eyes.