Also check this link to see where I got the idea: http://blog.craftzine.com/archive/2010/03/pillow_chair_from_t-shirts_and.html
Step 1: Explanation
(12)Large T-shirts of strong cotton fabric, any thin kind will rip when your friends jump on it. Trust me.
Sizzors, yes I like to spell siZZors like that.
some type of paper for drawing the confusing pattern
chalk in different colors
sewing machiene with stong thread
some kind of stuffing for inside it, I originally used styrofoam balls from an upholstery store then switched to foam blocks (we'll talk more about this later)
You can see what they used on their site.
Step 2: Making the pattern
First you will have to make 12 "HALF wedges"
In order to do this you will make a pattern which is HALF OF ONE WEDGE (because 1/2 + 1/2 makes 1):
get a large piece of paper (I used news paper) measuring 30X20 inches and draw a line down the center.
On the paper start with a 60 degree angle at the top center and draw a soft curved line down length of wedge. They explain this better in the video http://www.generation-t.com/?s=bean+bag+chair