In the same way that you can refashion finished garments to extend their use, you can also refashion patterns to extend the life of the style.
If the original style does well for your brand, there is no reason to reinvent the wheel and create a new style from scratch. You could swap out a sleeve, change the hem length, or turn a dress pattern into one for a skirt.
Refashioning the patterns you already have brings newness to your line and saves time and money in development as well. Your customers get something new, but with the same tried and true fit. It is a win-win.