I know that if an adventurer is in your shop and s/he wants to buy an equippable item, a notice will appear (about the stat change that will occur if you sell the item in question to them) and the adventurer will start using the new item.
However, advance orders are a little different because the customers buy in bulk. If an adventurer asks for "2 pieces of armor" in advance, and I sell him/her 2 equippable items, will s/he equip them the same as if s/he had bought them singly?

