git stash apply stash@{index}
git stash apply "stash@{n}"
or
git stash apply n
git stash apply 1
git stash apply "stash@{n}"
//or
git stash apply n
git checkout stash@{index} -- <filename> #stash particular file
git diff stash^! -- path/to/relevant/file/in/stash.ext perhaps/another/file.ext > my.patch
git apply < my.patch