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If it is like a mirror then what about people around you getting all that light reflected back into their eye - light which they can't really "see"? Seems like if you are around something like that all day where multiple people are wearing such clothes that it could possibly be damaging?

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If it is a cloth with a cloth's texture it wouldn't be bad since it would be reflected in such a diffuse pattern. Besides getting it directly from the sun anyways, you're already getting harsher glare reflections off of water, glass buildings, and metallic surfaces (cars) all around you.

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