title: Opencart - display products with specific option
body: <p>I'm using opencart 1.5.5.1 with vQMOD
  Is there any possibility or some extension like filter, to show products with specific option. </p>
  
  <p>For example i have a shop with clothes. In option i save size like XS,S,L.
  If i click some button like XS i want to see only clothes with XS size option.</p>