How can you tell Mackintosh makes the best rain coats one can buy in this day and age? For one thing, the brand’s been around since the 1820s, named after its Scottish founder Charles Mackintosh, who invented the process of rubberizing cotton to make the material watertight and windproof. Another indicator — COMME des GARCONS has seen fit to partner with Mackintosh on numerous projects. For the current season the two names have gotten together to introduce three new outerwear styles for men (and two for women), all handmade in Britain and featuring taped seams for fully waterproof construction. The pieces are available now at Dover Street Market.