The Dad Suit

I have four kids and each one has ruined one of my church suits in turn.  At just a few months they spit up on you or blow out of a diaper.  As they get older they end up eating cheesy crackers during the sermon and grab me with those cute little orange died dimple hands.  What I've needed was a suit I could hose down.  I needed a suit made of tarp material, 100% water and stain proof.  I wonder if carbon fiber would work?