If you know anybody in the chemical trade, you'll need Sodium Formaldehyde Sulphoxylate, Formic Acid and H202. Boil your suit in 8grams per litre SFS and 3 grams per litre FA. After a couple of hours you should be somewhere near to white (all the dye should be destroyed if its a good suit (dry clean only is a good sign)). When your happy, add a little H202 (32gpl) and keep at 60oc for an hour. Just seen how old this thread is but it might be useful anway The cotton stitching/lining will be damaged however, so keep an eye on it!