skeleton suit
small boy's suit with a tight short- or long-sleeved coat or jacket buttoned to a pair of high-waisted trousers
en-US/ˈskɛlətən ˈsut/
en-GB/ˈskɛlɪtn ˈsuːt/
small boy's suit with a tight short- or long-sleeved coat or jacket buttoned to a pair of high-waisted trousers