How would you figure out how much fabric is needed to make a knee length dress?

I need a 100% cotton/silk/ something (it doesn’t matter what the fabric is it just can’t be mixed) dress. I don’t know where to find a dress that is plain white and not mixed fabric or only available online, so I am going to try and make my own. I have all my measurements; waist, chest, etc. But I don’t know what to do with those measurements.
I am going to be stitching a pattern onto the dress once it’s made, and dyeing it with dyes so that’s why it needs to be 100% fabric.
(it’s called shibori stitching/dyeing)