1) Old cardigan;
3) Seam ripper (optional);
4) Trim (at least 2 yards--measure around the neck of your cardigan and along the lengths where the buttons and button holes are--it will depend on how long your cardi is or what size--measure before you get your yardage cut!!!!!!!)
5) Sewing machine (you can hand sew too but it will take forever plus a bottle of wine and some trashy tv);
6) Corresponding thread (top thread should match your trim and bobbin thread should match your cardi);
1) Select and old cardigan and a trim that you love. Try the cardi on to make sure it fits. If you hate the color, dye it first before you do the trim work.
I chose a cheap Old Navy sweater I have two of (you know--just in case I ruined it).
TIP: THE SIDE THAT HAD THE BUTTON HOLES PROBABLY HAS SOME SORT OF RIBBON OR BIAS TAPE THAT IS ALREADY AFFIXED TO THAT SIDE WHICH WILL MAKE THAT SIDE ONE LENGTH AND THE SIDE WITH THE BUTTONS STRETCHIER. MAKE SURE YOU ACCOUNT FOR THE DIFFERENCE WHEN YOU SEW AND TRY AND KEEP THE STRETCHY SIDE TAUGHT SO YOU DON'T END UP WITH TWO DIFFERENT LENGTH CARDI SIDES (ahem yes that happened with this sweater....)