First you need your suit jacket.
Not all suit jackets will be the same to disassemble as mine. Use your brain and if some thing on yours is different just improvise.
Start by cutting off the sleeve by cutting around the sleeves outer seam that attaches it to the shoulder.
Once you've gone all the way around you can then then start cutting around the lining's seam, that will remove the sleeve completely.
Now go back to the shoulder and cut around the other side of the seam to remove the seam.
You can now take the shoulder pad out. You can keep this to make some thing with or you can just throw it away!
Now go back to the sleeve and pull the lining out so that the sleeve becomes inside out with its lining coming off of the wrist. Detach the two pieces from each other in the same manner you detached the sleeve from the shirt.
Now it's time to open up the sleeve. Cut out the seam (both sides, so the seam is completely detached from the sleeve)that runs from the arm pit to the wrist.
The sleeve should then look something like this. You can remove the buttons if you wish. I left them on.
Repeat the process on the other sleeve.
You can then start cutting out the lining by using your scissors and cutting along the edge seam that attaches the lining. There may be tricky "obstacles" to go around... but you'll figure it out!
You can then either un-do or cut off any bits of lining still left on the outer fabric.
You can then cut out and lace, buttons, collars, etc (any thing you don't want on your fabric). I would Highly suggest removing the collar.
You can take out all the seams in the two different fabrics if you wish but i found it to be a waist of time that left you with smaller pieces of fabric. I did not undo them but left them where they are.
Now you have a nice pile of fabric to use as you wish.