I love denim!  The best pairing is to mix and match light and dark denims. When done right, it looks effortless and chic.  Plus denim for children provides multiple no fail outfits.  You can work this look by tucking in the shirt messy, buttoning it all the way up, rolling up the sleeves or layering it under a sweatshirt, sweater or jacket.  Finish the look with sneakers, loafers, booties or heels.

Examples from H&M, In Style and Media Prive