Custom page with no side-bar

I know this topic has been addressed ad nauseum, but please bear with my lack of understanding.
I am creating a WordPress site that has a combination of static pages, a blog page, and a wp ecommerce site. My (slightly customized) them is magazine-basic. My problem is that the pages that make up the ecommerce site are too large to fit in the normal content pages.
I have tried to create custom page templates, but since the original page template does not call the sidebar.php, I can’t find where to edit that out for this custom page template.

My original page template looks like this:

<?php get_header(); ?>
<?php get_template_part( ‘loop’, ‘page’ ); ?>
<?php get_footer(); ?>

My custom page template looks like this:
<?php /* Template Name: HW No Sidebar */ ?>
<?php get_header(); ?>
<?php get_template_part( ‘loop’, ‘page’ ); ?>
<?php get_footer(); ?>

Obviously, this is going to display the same as the rest of the pages, because there is no edit to remove sidebars.

The test site where I am working on this is
http://www.pawsitivelysimpledesign.com/workspace

Thanks!