From dictionary.com
queen-size [kween-sahyz]
adjective
1. (of a bed) larger than a double bed, but smaller than king-size, usually 60 inches (152 cm) wide and 80 inches (203 cm) long.
2. pertaining to or made for a queen-size bed: queen-size blankets.
3. of a size larger than average; often used as a euphemism: 'a store specializing in queen-size clothing'.
In this case, definition #3 is the relevant one.
http://dictionary.reference.com/browse/queen-size
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