I disagree. I went from 215 lbs to 160 lbs and did not keep any of my old suits/jackets. Not having those clothes as a fallback position is a good incentive to keep the weight off. It's been five years and counting for me. OP can resize on the way down if he's still losing weight, but 42 to 40 is at or beyond the level of doable -- you lose more size in your shoulders and chest than you would expect. Also, plan on getting new shirts, because the necks will become too large.