GWAR you suck at seiyuu jokes, hard.

Does that even count? Konata cosplays Haruhi in the actual show.

No, she cosplays Yuki. And this is the outfit she wears at that time in episode 24.

So this is almost definitely not a seiyuu joke, and just a Yuki cosplay instead.

Actually, I think it's a cosplay as Kyonko. Post 222729 is another example of this.

piespy said:
No, she cosplays Yuki. And this is the outfit she wears at that time in episode 24.

So this is almost definitely not a seiyuu joke, and just a Yuki cosplay instead.

She does both; though in the last episode, Konata does Yuki in the witch outfit, but this is indeed a Kyonko cosplay (due to the hair style)