No fine clothes can hide the clown.
More French Proverbs:
It is just that the priest should live by the altar.French
Do not lend your money to a great man.
French
When all you have is a hammer, everything looks like a nail.
French
It is not the greatest beauties that inspire the most profound passion.
French
Rich people never know who their friends are.
French
Whilst the dogs are growling at each other the wolf devours the sheep.
French