More to explore:
DIY pintuck duvet cover using a machine. This tutorial is the one I will use! Living on the Chic: DIY Pin Tucked Duvet Cover
DIY Pintucked Duvet Cover. Tons of great DIY ideas and tips
DIY pintucked duvet cover (like West Elm! But wayyyy cheaper)
diy duvet cover.... how to make pin tucks with a sewing machine
I love this DIY pintucked duvet cover. I've been admiring these in retail stores but couldn't bring myself to spend the money. This is worth a try (once I get a sewing machine!).