They dressed in new 'school' clothes (i.e., regular clothes that are new and they really like a lot). Since their school doesn't have uniforms or much of a dress code enforced, they can pretty much wear what they like.
I made their lunch for them with extra love and care, making it extra special for such a special day.
I know he wants to go to school, too, but he's got 3 more years at home.
I hope my kids and yours all have a fabulous first day of school and the best school year yet!