I have noticed many Haredi Rabbonim who do not wear ties through out the year (Shabbos, Yom Tov, Simchas) even though they aren't chasidish.
Does anyone know the reason?
I was thinking along the lines due to the historical association with of ties.
"There is a long history of neckwear worn by soldiers (Roman), whether as part of a uniform or as a symbol of belonging to a particular group. Some form of neckwear other than the outdoor scarf can be traced intermittently through many centuries." (Wikipedia)