I usually wear an apron when washing dishes to soak up small splashes. It's more important if EnviroKid is helping, as his splashes tend to be bigger--sometimes they soak through our aprons and our clothes get wet anyway, but usually aprons are worthwhile. We also wear aprons when baking (flour seems to get on me no matter how careful I am) and when cooking staining foods like tomato sauce or oily stuff.
EnviroDaddy and I have identical unisex striped canvas aprons.
I also have a flowery apron with pink pockets that reverses to pink with flowery pockets and has an adjustable neck strap; I really like that one. EnviroKid has THREE aprons: one from Home Depot, one with cars on it, and one that was EnviroDaddy's as a child and says "I love Mommy and Mommy loves me" all over it.
When we're working in the church kitchen, there's a whole drawer full of aprons to choose from. None of them are kid-sized, but EnviroKid likes to wear a flowery ruffly half-apron tied under his armpits. I like to wear the one that says, "Have you hugged an Episcopalian today?" for the fringe benefits.