Wearing ties at work
It is normally believed that the origins of ties are the Christian cross and thus it is totally unlawful (haram) to wear them.
However, one of the great contemporary Jurists, Shaykh Mufti Taqi Usmani (Allah preserve him) researched the origins of ties by looking into the various books compiled on the history of each clothing, but was not able to find that it originates from the cross.
It is also not considered imitation of the non-believers (Kuffar) because it is not something that is uniquely characteristic of them, unless one wears a tie because one WANTS to be like the Kuffar.
Therefore, it would be permissible to wear ties, though better not to whenever reasonably possible, as it is superior to avoid the dress of the unbelievers even if there is no imitation of them. One should avoid wearing it in prayer and other times and should only confine it to work, as many scholars have declared it to be impermissible.
And Allah Knows Best.
Muhammad ibn Adam
Leicester , UK