Bradley-D

// Add the div to wrap the image on the archive pages
add_action( 'woocommerce_before_shop_loop_item_title', create_function('', 'echo "<div class=\"archive-img-wrap\">";'), 5, 2);
add_action( 'woocommerce_before_shop_loop_item_title',create_function('', 'echo "</div>";'), 12, 2);

// If there is sub categories on the archive page add a wrap around their images as well
add_action( 'woocommerce_before_subcategory_title', create_function( '', 'echo "<div class=\"sub-archive-img-wrapper\">";'), 5, 2 );
add_action( 'woocommerce_before_subcategory_title', create_function( '', 'echo "</div>";' ), 12, 2 );