[git] How to download a branch with git?

Git clone and cd in the repo name:

$ git clone https://github.com/PabloEzequiel/iOS-AppleWach.git
Cloning into 'iOS-AppleWach'...
$ cd iOS-AppleWach

Switch to the branch (a GitHub page) that I want:

$ git checkout -b gh-pages origin/gh-pages
Branch gh-pages set up to track remote branch gh-pages from origin.
Switched to a new branch 'gh-pages'

And pull the branch:

$ git pull
Already up-to-date.

ls:

$ ls
index.html      params.json     stylesheets