One practical problem I see about women wearing niqab is that it may be difficult to distinguish one woman from another. (E.g. "the one with long brown hair..." is not effective.)
Question: Is determining which niqabi is your wife a problem for Muslim men?
I'm curious about the situation of a Muslim man trying to find his wife among a group of women. If a mistake were made, it could lead to all sorts of drama. I'm wondering how big a problem this is, and if it is a problem, how it's resolved.