Hi,My name is Jack Heywood I,ve have a clothing alterations shop for the past 30 years,I have just started a teaching website for any one who is interested in altering their own clothes.Now a suit jacket into a vest.I hope you have some sewing experience,this isn 't the easiest of jobs.Now don't let me put you off,first go to a haberdashery shop and get your self a pattern,and if you don't have one get a seam ripper,the pattern will have instructions that will help you,Now with the seam ripper remove the sleeves,lining,lapels,collar and the side seams and shoulder seams.Are you now beginning to understand why it's not the easiest of jobs.Now you are ready for the pattern.That should keep you going for a while.Now if you need more help e-mail me I'm more than happy to help.Happy sewing Jack. info@sew-so-easy.com