Tie - plain is best. Silk is most common but a good plain wool tie will do just as well as long as it is clean. Check for stains along the front. Don't worry if on the back only. Learn how to do a tie properly. If it looks like theses below (A) then well done. If it looks like the ones below those (B) then your sadly out of practice and must continue till you achieve (A). No excuses.