There are lots of information available on youtube and on internet regarding how to wear saree. Sarees/saris can be worn as a readymade saree only if it is properly stiched as a skirt with scarf attached. In west lots of people prefer to have readymade blouse which comes in different styles, some has embroidery at the back of blouse and some fully embroided. Saree/sari has to be worn over petticoat (underskirt) only with drawstring not elastic.