Integrate WooCommerce in your custom theme, see http://docs.woothemes.com/document/third-party-custom-theme-compatibility/. Be aware that if your parent theme uses "woocommerce.php" to remove or rename this file (this change will be lost when updating the theme).

functions.php

// WooCommerce theme integration, see https://gist.github.com/Willem-Siebe/9cd10326c07f5e3e8076.

/**
* woocommerce_before_main_content hook
*
* @hooked woocommerce_output_content_wrapper - 10 (outputs opening divs for the content)
* @hooked woocommerce_breadcrumb - 20
*/

remove_action( 'woocommerce_before_main_content', 'woocommerce_output_content_wrapper', 10 );

/**
* woocommerce_after_main_content hook
*
* @hooked woocommerce_output_content_wrapper_end - 10 (outputs closing divs for the content)
*/

remove_action( 'woocommerce_after_main_content', 'woocommerce_output_content_wrapper_end', 10 );


/**
* woocommerce_sidebar hook
*
* @hooked woocommerce_get_sidebar - 10
*/

remove_action( 'woocommerce_sidebar', 'woocommerce_get_sidebar', 10 );

function wsis_wrapper_start() {
  echo '<article class="wsis-article-woocommerce">';
}

function wsis_wrapper_end() {
  echo '</article> <!-- end .wsis-article-woocommerce -->';
}

add_action('woocommerce_before_main_content', 'wsis_wrapper_start', 10);
add_action('woocommerce_after_main_content', 'wsis_wrapper_end', 10);