skivvy

Jan.11付けのThe Japan Times Onlineメルマガの記事に気になる単語がありました。
Convict flees from Hiroshima Prison clad in skivvies A 40-year-old man convicted of attempted murder has escaped from Hiroshima Prison dressed only in his underwear, and police have launched a manhunt for the scantily clad fugitive.
"skivvies" がその単語ですが、意味は後に続く文で "underwear" と言い換えられているので判ります。　"skivvies" の単数形は "skivvy" と思いますが、意味も含め辞書で確認します。
・Oxford English Dictionary:
1British informal a female domestic servant who performs menial tasks: I found a job as a maid-of-all-work, a skivvy.; a person doing work that is poorly paid and considered menial: I’m really the office skivvy
2 (also skivvy shirt) US & Australian a lightweight high-necked long-sleeved garment. a T-shirt or short-sleeved vest.
3 (skivvies) North American underwear consisting of a vest and underpants. [originally a US navy term]
・Collins English Dictionary:
1.slang mainly US a man's T-shirt or vest
2.(plural) slang mainly US men's underwear
3.Australian New Zealand a garment resembling a sweater with long sleeves and a polo neck, usually made of stretch cotton or cotton and polyester and worn by either sex
下着の意味で使うのは米国だけで、しかも複数形の "skivvies" として使うようです。