Praise be to Allah.
The Muslim is supposed to be distinct from non-Muslims in his appearance and clothing, because this is what Islam says. Also, the Muslim should not wear anything that is the distinctive clothing of the kuffaar. With regard to neckties, if a person can do without them, this is better, but if he has to wear them there is nothing wrong with that, in sha Allaah – but he should make sure that they are not made of natural silk and that they do not have crosses or pictures of animate creatures on them.
And Allaah knows best.