A lightweight rainjacket that can be compressed into a small pocket-sized bag.
And there she was - wearing a dark blue pac-a-mac over a blue brushed-nylon nightdress, topped off with a hairnet. It was as though Death itself had just walked into the kitchen. She always wore the pac-a-mac because a dressing gown would have taken up valuable space in her suitcase.
Originally a brand name coined in 1949 as a shortening of "pack a macintosh".
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