Viscose is a naturally derived material that has undergone a chemical process to turn it into fibre, because of this it has all the great properties of natural fibre such as being cool, lightweight and naturally absorbent. It is quite a delicate fibre so should be treated gently, washing at a cool temperature of 30 degrees will be sufficient to get out any stains and dirt. Because of its absorbent nature viscose soaks up lots of water when it is washed, this caused the fibres to swell and once dry the garment will shrink as the fibres crinkle. This is the nature of viscose and not a fault in the cloth, it can be easily fixed by being ironed on a cool setting to straighten the fibres and return the garment to the original size.
Viscose creases easily but these creases also drop out very easily, you can either press your garment to remove creases, alternatively hang in a steamy room (such as when taking a shower) and the creases should drop out quickly. It is best to store viscose on hangers to avoid these creases but ensure the hangers are padded as hangers can cause impression marks at the shoulders.