Look in the pockets of coats, robes, etc.
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I don't use glasses for very close work, so I take them off constantly to read, sew, make jewelry. Then I don't recall doing it.

A couple months ago, a nice new pair disappeared. Finally my husband decided he would find them or die. He did find them - almost invisible on the black pad which holds the foot control to my serger. I had taken them off to sew, and they had tried to hide.