Longman Dictionary of Contemporary English
Wiktionary
n. The uniform traditionally worn by enlisted seamen, later a popular clothing style for children.
WordNet
n. a boy's ensemble; copied from a sailor's uniform
Wikipedia
A sailor suit is a uniform traditionally worn by enlisted seamen in the navy, and other government funded sea services. It later developed into a popular clothing style for children, especially as dress clothes.
Usage examples of "sailor suit".
She was wearing a sailor suit that was several sizes too large, white flared pants and a white shirt, sleeves rolled up several times.
A thin, pale-faced young boy in a sailor suit stood in front of the man.
This would add to his general fund of knowledge, and when he took off the sailor suit, it just might result in a larger paycheck.
I preferred the cupboard because under the bed I would have soiled my fastidious navy-blue sailor suit.
Well, maybe we could dress her in a little sailor suit or something.
With the other he reached for the boy in the sailor suit and seized his neck.
The boy in the sailor suit - Bill - raised two fingers to the corners of his mouth and whistled.
The boy wore a sailor suit, clacked across the stage in tap shoes.
He tried to get into the Marines, but when they found out he was a good swimmer and a non-citizen they put him in a sailor suit and made him drive a barge in Okinawa.
By the left-hand rail of the pier stands a three-year-old in a sailor suit.
She would say later that she thought she was the only person in the garden of Eden, and then she came upon this creature in a sailor suit who was acting as though he already owned everything.