(Woocommerce) Order by price when entering specific category

You can use the filter below, as suggested by @sabarnix at

https://stackoverflow.com/questions/24939337/woocommerce-different-default-sorting-for-different-categories

add_filter('woocommerce_get_catalog_ordering_args', 'tk_woocommerce_catalog_orderby');
function tk_woocommerce_catalog_orderby( $args ) {
    if( is_product_category( 'shirts' ) ) {
        $args['orderby']  = 'meta_value_num';
        $args['order']    = 'ASC';
        $args['meta_key'] = '_price'; 
    }
    return $args;
}