Our history of having pockets has been for phones, wallets and keys usually. I wonder what the first instance was it it's use
Clothes don't preserve very well in the archaeological record in most cases. This question is nearly impossible to answer. Pockets may have been used tens of thousands of years ago in any number of places across the globe. The first recorded instance of a pocket is not going to be the first instance of a pocket being used.
hi! FYI related questions have come up before, so check out previous responses here