git-svn questions: how to clone/init non-standard layout branches/tags?

There are a few svn repositories that use non-standard layout like this:

<path_to_project>/trunk <path_to_project>/production <path_to_project>/some_branch

production and some_branch are indeed branched from trunk.

1. How do you init/clone svn repositories like that?
2. Is there a way to add a new svn branch like that (say production  
or some_branch) to an existing git-svn repository that has trunk cloned?

Thanks!

__Luke