There are no good suitings for hot weather. Really. The English inventors of the suit did not face much heat over the course of their summer and accordingly did little to take it into account despite their experience in India. What we have available to us today are really suitings for the sea shore – cloths for 80 degree (27C) days with a breeze. When temperatures exceed 90F (32C) men can only sweat, or flee into an air conditioned environment.