Though he had his clothes underneath that outfit he still felt so embarrassed that he wanted to burrow into the ground and hide in there until she found another mannequin. He now understood why she befriended one of the females in the Huishe clan despite them being an open supporter of Rui Fei getting together with Huishe Yingtao. It was because that female was the best at sewing and Rui Li was learning from her.
Let's just say a lot of things happened in Niuq that Rui Yewan didn't want to talk about. Now that she had mentioned this gift Rui Yewan couldn't help but want to warn his sister in law that it was a trap but he also wanted his brother to be happy.
If Ji Yao wins then he won't have to wear that humiliating outfit but if he loses then his brother might be the happiest man on earth. Thus he decided to zip his mouth shut and not involve himself in this matter.