Make “Out of stock” products selectable

Hi,
I realized a website for a client using your plugin.
In the store every product has a lot of variations, but the combination is always “Color + Size”, as this company sells clothing.
Is it possible to make the blurred/crossed variations selectable? The user should be able to select every combination in order to view the variation image in the gallery, even if that variation is out of stock.

Thank you very much,
Davide