the singer tells PEOPLE, adding that the outfit's "unique take on chaps," is what makes it so special. "Of course, we are in the 'Denim & Rhinestones' era, so we've definitely got a lot of both ...

And while their lives do involve lots of glitz and glam ... but straight-leg denim has had a place in the fashion scene every single decade. Unlike skinny jeans, which have their fair share ...