] ... a man would already be wearing three layers over his torso (shirt, waistcoat, and tailcoat), so there was no reason to wear anything under the shirt...

to ward off the English weather for someone who has lived in a tropical climate, as Col Brandon has: I speak from shivering personal experience.

I may be the only person in Pemberley who regards Mr Woodhouse as heroic in his battle to ensure that young ladies do not go around without their shawls.