Things you’ll need:

500 yards or more of yarn. It does not matter the weight since this has a pattern repeat. For the example I used one Caron Big Cake which is worsted #4 yarn and one cake was big enough.
Hook - Use a hook two sizes bigger than the suggested hook size for your yarn. This will ensure a nice drape and the puff stitches won’t tighten up the work.
Yarn needle
Scissors
Stitch markers

You can find a Youtube video tutorial here: https://youtu.be/c01z4qPjWoA

Stitches and techniques to know:

ch - Chain
dc - Double Crochet
sc - Single Crochet
sl st - Slip Stitch
sk st - Skip Stitch
hdc - Half Double Crochet.
In the third loop - Work into the back third loop of a hdc.
In the front loop (flo) - Work into the front loop of a hdc from the row before
fpdc - Front Post Double Crochet
bpdc - Back Post Double Crochet
ex-puff - Extended Puff Stitch. Yarn over, pull up a loop, yarn over, pull up a loop, yarn over, pull up a loop. Pull through all but the last two loops on your hook. Yarn over and pull through the two loops.