All Dressed up But no Where to go!

We ordered Nino a school uniform at the beginning of the year so he could join the Preschool class.  It finally arrived.  I think he looks super cute in his school clothes.  But of course, now he doesn't really want to go to school.  He'll go for about 30 minutes once or twice a day.  He tells the teacher that he is going home to 'rest' and he'll be back later.