As the waistcoat disappeared and three button and double breasted jackets were replaced by the two button style, men began to notice that the lower button point on the new coats left their neckties more inclined to swing in the air. Enter the tie bar, that particularly American bit of metal intended to affix the necktie firmly in place (there are also the tie tack and sundry other devices but they all tend to have serious flaws that render them unworthy of consideration).
Now I will admit to having threaded a gold safety pin through a knit tie once upon a time, but generally I think the tie bar too flashy. In this I am not alone, as several hundred million European men seem to be of the same opinion. I do not however place wearing a tie bar into the category of venal dress sins either. That is, so long as the bar is a reasonably plain length of gold worn at a rakish slant. No matter how justifiably proud a man may be of having been a guest at the White House, the Presidential seal is too ornate in my opinion. There are many better ways to display one's patriotism.
Men who absolutely cannot stand to have their neckties moving around do have an alternative to jewelry for securing the necktie and that is to knot the thing so that the rear blade is longer than the front, with said rear tucked into one's trousers. For that matter, there are those who insert the entire bottom of the tie inside the waistband, but I do not recommend the practice as the tie usually works itself into some undesireable attitude and is then held firmly in place.
For myself, I think the the Italians have the right idea in this regard. Most of the ones of my acquaintance just let the necktie swing. And so do I.