Raw denim will stretch as you wear it, and then shrink after you wash it. This is because the denim has not yet come in contact with water, which causes the yarns to shrink and tighten. Most denim is sanforized, which helps reduce shrinkage after washing, but this process won’t eliminate shrinkage completely. There will be less shrinkage on a washed pair of jeans. The denim being selvedge won’t affect whether it stretches or not. Check out our guide on the Life Cycle of Raw Jeans Shrinkage and Stretching for an in-depth analysis.