Clothes don’t make a monk.
As in to not judge someone based on their looks.
L’abito non fa il monaco.
Don’t put your finger between husband and wife.
As in don’t get involved into couples’ drama
Tra moglie e marito non mettere il dito
In Portugal they have one I adore:
Donkey’s mate aint transparent
This applies when someone is blocking your view like when someone stops in front of the tv.
Carne de burro não é transparente