The undetected openings and small entry points allow dirt, dust, moths, and other critters to subliminally enter the bag you had 'protected' your garments in and cause further unsuspecting damage.
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Plastic bags trap moisture, which quickly transfers to your clothing causing it to become mouldy. Cardboard boxes are easily infiltrated by vermin and pests like silverfish.
Don't store anything too fragile or expensive in the garage. Over time, your garage's temperature, humidity, pests, and even your body heat can diminish the quality of your clothing. Make sure to set aside some closet space in the garage.