Answer:
The French word for 'fun size' in women's clothing.
Different lights do make me strange, thus into different sizes I will change.
What goes in the water red, and comes out black?
What is the thing that stays the same size, but the more it's used the more it decreases?
I am a good state, there can be no doubt of it; But those who are in, entirely are out of it.
What covers its face with its hands, speaks no language, yet most known what it's saying?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?