noun (used with a plural verb) Baby Talk.

jam- (by aphesis and shortening from pajama) + -y2 + -s3

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Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To jammies

(usually plural) loose-fitting nightclothes worn for sleeping or lounging; have a jacket top and trousers [syn: pajama
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
The people with the pillows and the snuggies and the jammies.
Grab the jammies and the toothbrush, but leave the pillow on the bed.
Nobody knows if you are in your jammies or formal dress, drinking coffee,
  eating chips or whatever.
Come in your jammies to make a craft and listen to bedtime stories.
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