Ice King's robe
was made by following the tailored robe
pattern from this site:http://www.servantsofthelight.org/knowledge/makingrobes.html
Just follow the instructions and take the measurements of your wearer to use when you draw your pattern on the butcher paper.
Cut out the pattern and trace it on your fabric. Cut out all the pieces and follow the instructions to sew the robe.
I left off the hood and didnt put in a zipper