The phrase "army trunks" is correct and usable in written English.
It can be used to refer to a type of shorts or swimwear typically associated with military or army styles.
Example: "He packed his army trunks for the beach trip, ready for a day of sun and surf."
Alternatives: "military shorts" or "camouflage swim trunks".
I myself drove my car directly from the agency to the blacksmith's, and had the smith affix two enormous iron brackets to the port running board to support an army trunk.
Government forces claimed it as their holiday retreat and on the sun terraces Sophia's sexy bikinis were replaced by army-regulation trunks.
At the outbreak of the American Revolutionary War in April 1775 his Milton mansion was seized for use as an army barracks, and a trunk containing copies of much of his correspondence fell into rebel hands.
Police patrols found an abandoned car with over 200 pounds of homemade explosives packed in the trunk and British army bomb disposal experts defused and dismantled the car bomb.
His opponent no Golden Gloves champion was a grim, heavily muscled black fighter who, in place of satin trunks and boxing boots, wore Army-surplus shorts and basketball shoes.
His opponent — no Golden Gloves champion — was a grim, heavily muscled black fighter who, in place of satin trunks and boxing boots, wore Army-surplus shorts and basketball shoes.
Since they all stayed in character, it was like a parallel universe where everyone dressed in colored trunks, pink leisure suits, tribal feathers and army fatigues.
On Oct. 21, Israeli troops near the West Bank city of Jenin opened fire on Palestinians who, the Israeli Army says, were seen planting a bomb by the trunk of an olive tree.
There's Dad in another snap, a buff 22-year-old in trunks and T-shirt, off-duty from Santa Ana Army Air Base and sitting astride a bicycle on Balboa Island in the summer of '44.
