Step 1: Gather Materials
Material - I chose this fabric because it was lying around, and is quite thick, making it suitable for the task at hand.
Scissors - the sharper the better
Thread - preferably of a similar colour to your material
Sewing Machine - you could probably do all of this by hand but i'm lazy.
Laptop - for measuring, and for using with the sleeve after construction.
Pen - preferably something that will wash off, i didnt have this so used a marker that was handy.
Step 3: Fold it over
Step 4: Mark the seam
when you have done this transfer the marks to the back side of the material as accururately as possible. If its not perfect it doesnt matter, but as long as they are close.
Step 5: Pin it together
Step 6: Check the fit
Step 7: Sew it together
Step 8: Trim the excess
Step 9: Close the bottom
When you have done this trim as before.