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.added_size {
  border-width: 2px;
  border-style: solid;
  padding: 2px;
  color: grey;
}

div.grid-view-item__sizes {
  margin-top: 5px;
}

    {% assign prefix = 'UK' %}
    
    {% assign sizes = '' %}
    {% for tag in product.tags %}
      {% if tag contains prefix %}
        {% assign sizes = sizes | append: tag | append: '||' %}
      {% endif %}
    {% endfor %}
    
    {% if sizes %}
    <div class="grid-view-item__sizes">
      {% assign sizes = sizes | split: '||' %}
      {% for size in sizes %}
        <span class="added_size">{{ size }}</span>
      {% endfor %}
    </div>
    {% endif %}