Show a png image based on product tags with a matching name. e.g. tag a product with 'mens-crew-neck-size-guide' to display a png of the same name.

tag-based-size-guides.liquid

<section class="item" id="tab-2" data-title="Size Guides">
  <div class="item-content">
    {% for tag in product.tags %}
      {% if tag contains 'size-guide'%}
      {% capture tagImage %}{{tag}}.png{% endcapture %}
        <img class="size-guide" src="{{ tagImage | asset_img_url: '1200x' }}" width="700" alt="{{ tag }}">
      {% endif %}
    {% endfor %}
  </div>
</section>