Silk undershirts?

My mom used to get thin silk short-sleeved undershirts from wintersilks, but they’re not made anymore. Any suggestions? She looked at quince and said those looked thicker, like tshirts, instead of undershirts.

She just wants something super-light to wear under shirts so that she just has to wash the undershirts and not the outer shirts while traveling.

She finds wool (even 100% merino) to be itchy.