Im building an X-cart tshirts store, and I would like that users could search by size. For example, lets say a customer is XL, he will click a button or link to be shown only tshirts in size XL available in stock.
All of the tshirts in the store share the same options/variants, they go from XS to XXL (woman and man). A sample of what I want is in this site:
[url removed, login to view]
(look at the white buttons above the tshirts).