So I needed no convincing of the virtues of this noble British label. But I must say, the made-to-measure T-shirt is a cut above. It fits the way a T-shirt should, neither too baggy nor too tight.

All this flashed through my head the other day when I was invited, in my capacity as editor of Britain’s best-dressed magazine, to help celebrate the opening of a splendid new Sunspel shop, on Jermyn ...