Define an Old Myth

I am soft, sturdy, never leaving, always giving, forever pleasing.
I am never ending flour, always eat, come again, "we'll miss you 'til then"
I am pillows and blankets, chocolates and sweaters -
Only used on occasion, but used and used again.
Always reliable, never mystery or fire, just plain jane simple
Enticing when needed, but sickening when filled.
I am never ending pockets.
I am old entertainment.
I am the poster on the wall.