Enqueue a stylesheet with conditional tags

functions.php

function bones_scripts_and_styles() {
  global $wp_styles; // <-- you need this
  
  // ie-only style sheet
  wp_register_style( 'ie-only', get_stylesheet_directory_uri() . '/path/to/ie.css', array(), '' );
  wp_enqueue_style( 'ie-only' );

  $wp_styles->add_data( 'bones-ie-only', 'conditional', 'lt IE 9' ); // add conditional wrapper around ie stylesheet
}