I have always been curious why denim is so popular when it comes to clothing. Whenever I go shopping, I notice that almost every store has a huge collection of denim clothing, from jeans to jackets, to skirts and shorts. I also see people dressed in denim almost every day, regardless of the occasion or season. I have tried researching it myself, but I haven't found a convincing answer yet. Can someone help me understand why denim is so popular and why it has become such a universal fashion trend?