Show order limits
Tell shoppers how many of the option they pick they can order.
Each example below is the actual published output of the Variation purchase quantity range widget for sample products: a Sable brush set (Medium has 5 in stock, Small is out of stock but can be backordered) and Refined linseed oil, which does not track stock. On a product page the text follows the option the shopper picks.
The Medium brush set (5 in stock, no backorders): Quantity: 1 to 5.