Hankies for wives, girlfriends, moms and other lovely ladies are available. This is one of the options that is suitable for a mother-in-law. These are heirloom quality.
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A Brides Eye View is your gifting source for thoughtful wedding gifts. Here is one for the Groom to give to his future mother-in-law: https://www.etsy.com/listing/95465014/groom-to-honor-his-mother-in-law-a
The size for ladies is 11" or 12" square and for men, 13" square. The hankies are 100% cotton and a classic, understated envelop is included.