Halloween // Help with Gandalf the Grey costume?

I am looking to make a adult male Gandalf costume (pre-Balrog Grey). I'm a woodworker, so I can make the staff and sword, and I'm pretty confident in making the hat (I have some felt that's pretty spot on).

I have no idea, however, how to make the rest of the costume. I'd like to do something fairly true to the movie (robes, cloak, medieval style braided belt), instead of the off-the-shelf version, but I also don't want to spend an inordinate amount of money. I am more than willing to sew as long as a pattern isn't too complicated (I have to do it by hand, no machine, so it's limited.

Any ideas, recommendations, materials suggestions, etc. you have to offer would be greatly appreciated! (a more complicated cosplay version shown below)

https://preview.redd.it/36axxqy9loqb1.jpg?width=350&format=pjpg&auto=webp&s=3e904d76b07b1be9e0d70fdc32b58523454309fb