Why did the author say, regarding those whose testimony is not accepted: "and the one who exposes his 'awrah (part of the body that must be covered) to onlookers"

The questioner:
May Allah reward you, Honorable Shaykh. This questioner says: The author (may Allah have mercy on him) said, "and the one who exposes his 'awrah to onlookers."

The Shaykh:
Yes, the one who has no shame and exposes his 'awrah in front of people, his testimony is not accepted because he is lax.

The presenter:
He says: Good.

The Shaykh:
He is lax in covering himself, so it is not believed that he will be lax in testimony as well. Even the one who eats in the market, his testimony is not accepted because he is slightly lacking in modesty. Yes.

The questioner:
Does the one who wears short trousers that expose his thighs fall under this?

The Shaykh:
Yes.

The presenter:
May Allah reward you.

The questioner:
They are exposed. Do the thighs fall under this?

The Shaykh:
Yes, the one who does not cover himself, his testimony is not accepted, and the thighs are part of the 'awrah. Yes.