 You're not crazy your black jeans smell. To achieve that color, they're dyed over and over again in a sulfur dye. And if you notice it getting worse throughout the day, that's your body heat warming that stank up. Yum. There are a few things you can do to get the reek out, but the best way to avoid it is to give them a sniff in the store. And if they smell bad, don't buy them.