I think that's due to the fact that Shoichi didn't have that outfit when the CG was made, so they made it with the default casual outfit of Sho and didn't change it when the outfit changed
I had some screenshots of this day from earlier builds (before Haruki's redesign (0.57 probably)), where Shoichi wears the outfit he supposed to on this day, the same one in CG. This is the first time i've run into an issue like that.
