From Longman Dictionary of Contemporary Englishbooteeboot‧ee, bootie /ˈbuːtiː, buːˈtiː/ noun [countable] DCCa short thick sock that a baby wears instead of a shoe
Examples from the Corpus
bootee• Include a summer or shortie wetsuit and bootees.• Inside the bootee was wrapped a small gold ring.• Her nose wrinkled at the smell of beer, and she kicked off her mink-trimmed bootees as if she were kicking Boyd. 