tagArchiveOrderByPostMeta

<?php
/**
 * The template for displaying Tag pages
 *
 * Used to display archive-type pages for posts in a tag.
 *
 * @link http://codex.wordpress.org/Template_Hierarchy
 *
 * @package WordPress
 * @subpackage Twenty_Thirteen
 * @since Twenty Thirteen 1.0
 */

get_header(); ?>

    <div id="primary" class="content-area">
        <div id="content" class="site-content" role="main">

        <?php

            $tags_query = new WP_Query('orderby=meta_value&meta_key=post_tagorder_num&order=ASC');

        ?>


        <?php if ($tags_query->have_posts() ) : ?>
            <header class="archive-header">
                <h1 class="archive-title"><?php printf( __( 'Tag Archives: %s', 'twentythirteen' ), single_tag_title( '', false ) ); ?></h1>

                <?php if ( tag_description() ) : // Show an optional tag description ?>
                <div class="archive-meta"><?php echo tag_description(); ?></div>
                <?php endif; ?>
            </header><!-- .archive-header -->

            <?php /* The loop */ ?>
            <?php while ( $tags_query->have_posts() ) : $tags_query->the_post(); ?>
                <?php get_template_part( 'content', get_post_format() ); ?>
            <?php endwhile; ?>

            <?php twentythirteen_paging_nav(); ?>

        <?php else : ?>
            <?php get_template_part( 'content', 'none' ); ?>
        <?php endif; ?>

        </div><!-- #content -->
    </div><!-- #primary -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>