Jun Ye rarely wears casual clothes, he always opts for formal shirts to match his coffin-like expression. Upon hearing this comment from his brother-in-law, it's clear that Jiang the Young Master is speaking sarcastically.
Just think about it, a King Yama face paired with a T-shirt is as out of place as wearing work clothes to till the fields or farmer sandals in a factory, completely inappropriate to the extreme.
"Just in time, you two are here to visit her, help me watch her while I go change." Seizing the opportunity, Jun Ye handed Sister Bai Lu over to his sister and brother-in-law for a while, eager to change out of this outfit. He should have guessed it. With Yao Ye's personality, the T-shirt was bought on purpose. Yao Ye's phone probably captured countless photos of him, waiting to tease him later.
