@Acolytus
This is just guess, but it's not much about surprise as is about loadout of time, effort and work to make these clothes. Even with his skill, it probably puts a strain on him, so he is keeping silent to not dissapoint anyone in the case he does not make it.
P.S. Takae mentioned he looks tired so there you have a hint.
@flamewingman
Naw he definitely feels something for her.
Hes always complimenting her on her beauty and they have had more then a few instances of staring at each other.
The problem is his self esteem issues.
I can hardly wait for the spread with all of them wearing the individual clothes he designed; I really love this artist, and I imagine it's gonna look great!
Just like some have said already, I am guessing he is making an outfit for everyone, especially given that he has had not much sleep, and knowing how his personality is, I am sure he is preparing something for everyone so no one gets left behind.