Forgetful
The duchess is so excited that she forgets to remove the tags from some of her new items because she is too happy to do so. Meghan Markle made her debut in public wearing a chic pencil dress and a brown leather purse. If you look at the bottom of the bag, you can find some clues.
These are the small bits of protective plastic that were added to the object before it was put up for sale so that it would not get damaged while it was being moved from place to place. Either she did not realise that she was expected to remove them, or she forgot to do so, but in either case, she was unaware that she was required to do so.