Sunglasses!
You can't live without them, especially when you are a female celebrity (celebreteuse).
Sunglasses :
*are fashionable
*make you look cool
*hide tired and puffy eyes fom photographers.
*protect your eyes
*etc etc...
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Ofcouse she needed these ice blue pair of glasses. The Alps: snow blindness, très dangerous!.
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You see, there was no need for men to be fashionable, cool etc. At least not in the 70s.
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This is clearly a fashion statement by Agnetha.
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Hmmm....reading glasses?
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The look of 1974