A trench raincoat is a long, water resistant coat with a belted waist, a storm flap across the chest and a collar that turns up against the wind. Duck Apparel sells trench raincoats in South Africa for the wet months, when the job is staying dry on the walk between a car, a station and an office rather than surviving deep cold. The collection covers The Regent Trench and The Landmark Trench, two coats built on the same idea in different proportions. A trench is the coat to reach for when rain is the problem and heavy insulation would leave you too warm.