This is a neat customization, directly requested by a WooWeekly subscriber who needed to literally show the remaining stock quantity for each ordered item to store managers, in order to have an immediate idea of low/zero stock quantities after each order.
If that’s not clear, simply take a look at the screenshot. In my dev site, I ordered a product that originally had stock quantity = 1. In the “New Order” email (thanks to the snippet below), beside the order item quantity of 1, there is also a “(0 remaining)” notice that clearly displays the item’s current stock level.
Cool, ha? So, let’s see how that’s coded. Enjoy!