In the the entries from 1984-85, the shorts come with a belt made of the same fabric as the shorts. In Spring 1986 they added a webbed belt.
From the catalogue: “Lightweight enough for a midsummer promenade in Nice, yet stursy enough to sit through a week’s worth of screenings at Cannes. The pre-washed 100% cotton won’t shrink or lose its sahep; perfect fit remains perfect after many washings. Generous (yet hardly prudish) mid-thigh length, with a webbed cotton belt and a back pocket with flap.”
Photos from eBay