Vern.
Straight off the cuff [pun pending]
Twas a time when Collars and Cuffs were not part of a shirt.
Consider you are wearing a three piece suit.
Jacket, Vest and Trousers.
All that was seen of the shirt was the collar and cuffs.
So that was all that was changed on a daily basis.
[Remember: folks washed once a week if they were lucky in those days]
I have a 'Collar box' here that belonged to my Great GrandFather.
Also a chain of button studs.
Similar thing. The shirts had only button holes on either side of the front opening, so you threaded studs into them.
Starched Collars were the best part of the laundry then.
They buttoned to your shirt.
And were often seen turned up above the lapels of your jacket.
Hope this gives some clues.
I've got pics somewhere of my GGFa dressed in this way.
circa 1880 - 1920
Cheers R.