OK, let’s be honest. Sweating is the most natural thing in the world, but unless you’re in the gym or pursuing some other suitably athletic activity, having a damp patch under your arm is an undignified experience. It also knows no vocational boundaries. Fashion editor, accountant, prime minister, it doesn’t matter. Either you sweat profusely from your armpits or you don’t and, to my dismay, I do. So I decided to put an end to it. Enter underarm…