White Walkers in the first and second season were nearly naked.
This guy from the start of the first season wears a raggy loin cloth, a vambrace, and boots. His three brothers in the background wear similar loin cloths and nothing on their chests.
This walker from the end of the second season has a vambrace on his forearm and not much else.
Later in the series, they are wearing clothes and even armor.
Fast-forward a few seasons to the Battle of Hardhome, and we see multiple walkers and the Night King all wearing clothes and armor. (Never guessed he was just a little vain enough to wear a decoration on his upper chest.)
We saw 4 walkers and the King in the Battle of the Tree all wearing armor.
Why did they start wearing armor? (Related questions: Why would they even care to wear clothes at all? They don't need clothing to protect them from blizzards. Do they make their own armor and clothes?)
I prefer answers from the book (even if the answer says the question is based on a false premise) more than answers from the TV series.
Edit to add: I am not asking about the wights, just the White Walkers and the Night King. I assume the wights and skeletons have whatever clothes they wore at the moment of re-animation and will wear those until the clothes are so shredded they fall off.