Today’s invention is buttonholes in the back of one’s tie -or more specifically the label at the back.
Why? Well the flapping tag on the narrow end would have a number of different buttonholes sewn along its length.
The tie would be put on and the narrow end fed through the loop in the back of the wide end as usual.
Then, one of the buttonholes on the label could be attached to one of the shirt buttons.
This would keep one’s tie in position (even if being pursued across fields by a malevolent cropsprayer) -but without the need for any ugly tiepins (or tucking it into one’s shirt).