bottom-size
$tax_query = array( 'relation' => 'OR', array( 'taxonomy' => 'pa_bottom-size', 'terms' => '86', 'field' => 'term_id', 'operator' => 'IN', 'include_children' => true, ), );
$tax_query = array( 'relation' => 'OR', array( 'taxonomy' => 'pa_bottom-size', 'terms' => '86', 'field' => 'term_id', 'operator' => 'IN', 'include_children' => true, ), );