Василий Пупкин

add_action( 'woocommerce_order_item_name', 'shop_product_id', 10, 2 );
function shop_product_id( $item_name, $item ) {
	return $item_name . " (id:" . $item['product_id'] . ")";
}

jQuery('a.woocommerce-loop-product__link').contents().unwrap();