Certain shawls are just for lounging; other shawls are definitely for special occasions. This Crochet Easy Shells Shawl is cotton and is good enough to be worn during special events like weddings.
It uses Patons Grace, which is 100% Mercerized Cotton. This is not dishwashing cotton but fashion cotton. With #3 weight yarn and lustre to the yarn, it provides incredible stitch definition.
This yarn is compact and has a bit of weight to it. So it drapes with your body. Being cotton, can keep you warm but also keep you cool.
Inside the free pattern adapted from Yarnspirations, you will find instructions for the written and crochet diagram. It's suggesting 6 balls of Patons Grace, but if you would like to make it bigger, you certainly can. Just continue, and it will expand as you will start off at the point of the shawl and work outward.