I manage to do this after getting whatever clothes items i can buy from the vending machine after being fully transformed, i disable the cameras in the security room before that by getting into the room you can get trap in inside the specimen room and searching for the card and the one to open the lock with, that trap room is also how you can get credits as well to buy stuff from the vending machine, you just have to keep on trying to take the shortest path possible until you manage to escape by the entrance.