Muddy backs or Can you just stay clean til you get in the door at school?

Now that is warming up a little my kids want to go outside! Go the the pool (a little premature)! Hunt for fireflies (you got a few more months to wait son)!  Scooter in the alley after dinner (do you see that it's pitch dark outside?)  But this morning before school, they had time to play outside.  Now, I like for my kids to wear clean clothes and to brush their hair for school.  I just want them to look like someone is taking care of them.  So my son walked out the door with a freshly laundered fleece jacket with a vest over it and my daughter went out with her equally clean clothes.  Bliss! About 20 minutes later we were frantically trying to get my daughter's 8 ton backpack in the car and the rest of the school "equipment" when my son turned around to reveal his entire backside covered with mud.  Not a thick layer but noticeable.  REALLY?  Apparently he fell off the swing onto the muddy ground below.  I thought briefly about other fleece jackets or sweatshirts he has and whether they are dirty or not and whether I wanted to go back in the house and look all over creation for them and make my daughter late for school.  Finally, I just brushed him off and got him in the car.  I had to let go of my "clean child at the beginning of the day" expectations and send him forth into the world and hope the teachers know he was at least fed this morning.  My daughter was clean but she doesn't really like to brush her hair and it really needs it so I did the final brush so that she wouldn't look like a street urchin, at least for the first 20 minutes of the school day.