How did the habit of putting vinegar on chips (fries) originate?

Vinegar has been in use for many centuries as a condiment (and beverage!). Chips have only been around since potatoes were imported to Europe, with the earliest (unreliable) date for french fried potatoes suggested being "before 1680." There seems to be no documentation of when chips and vinegar were first combined, but it was likely very soon after the chip was invented, since vinegar and salt were widely used as a condiment/seasoning long before then. Whether the first use of vinegar on chips was alone or from a pickled egg jar, we will likely never know. Note, however, that the main users of vinegar on chips (Britain and Commonwealth) often use malt vinegar, which would not have been used to pickle eggs. Also, eggs are pickled in brine (salt water) with added vinegar, sugar, and other ingredients, which to me makes it an unlikely candidate for the first use of vinegar on chips.

https://en.wikipedia.org/wiki/French_fried_potatoes
https://en.wikipedia.org/wiki/Pickled_eggs