For any age:
Snug as a bug in a rug.
Get a rug that is big enough to wrap around your body, starting under your arms. <
Wear a long sleeve shirt and long pants (whatever color, black or white works great), and whatever shoes.
Get a headband that looks like bug antennae. Use make up to look like any kind of bug.
You will look as snug as a bug in a rug!
Thanks to Kathryn for this great idea!