Some side saddles have a handkerchief slit cut into the off side flap. This has often perplexed me as I have never seen a photo or drawing of a handkerchief here, nor is it addressed in any of the rules of appointments.
It was suggested the other day on the Facebook group, that it would have been inappropriate (un-ladylike) while out hunting, to holler Tally-Ho! when you viewed the fox, and that a lady should wave her hanky. Now this actually makes sense for more than one reason. While out hunting, it is often frowned upon to "Halloa" or "Tally-Ho" because this distraction will not only startle the fox, but lift the heads of the hounds. Fox hounds are scent hounds, not sight hounds. If they lift their heads they may lose the scent, and the fox may now be out of sight and lost for good.
On the occasions when it is inadvisable to holler, a gentleman should indicate a sighting of the fox by facing his horse in that direction and removing his hat, hold it outstretched in the direction the fox has gone. Now suppose you are a lady out hunting in the early 20th century, and you have your hat pinned to your hair, or better yet, secured with a veil which covers the entire face and is snugged up under your chin. How do you signal? It makes sense that you might pull your hanky from your saddle and use that instead of your hat.
And this brings up another question. If you were wearing a veil, what other use would you have for a hanky? Is it possible, or even advisable, to blow your nose through a hunting veil?
These are the things that keep me up at night.