Hmm.... If you'd be looking at houses and estates, you'd be doing quite a fair bit of walking around.
In long pants, that will surely make you feel extremely hot and perspire like crazy, which at the end of the day may be the reason for people near your to frown upon you, for sweaty armpits and face that is
(by the way, even in shorts, this climate is challenging).
99% of all people here wear shorts whenever possible.
As long as your clothes are not teared, no one will bother frowning upon you for your dressing style, don't worry.
Eric