Answer:
What is often on the ground getting stepped on by others, but you don’t have to wash it because it never get dirty, in fact you couldn’t wash it even if you tried?
What gets bigger the more you take away from it?
A standard dimension for sandwiches and rulers
Sitting down you have it, Standing up you don't.
There's one in every deck of cards and in a famous movie
I start with T end with T and within me is T.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?