Michelle Phan has a great Glinda Makeup Tutorial on her website. She really catches Glinda’s beauty in her design and the tutorial is easy to follow, video style.
Gary Jones (costume designer) talks about the his costume creations for Oz, the Great & Powerful. There are great detail shots and explanations on the costumes for Oz, Glinda, and the Wicked Witch of the West in this youtube video.
The Fashion Spot interviewed Gary Jones about the costumes for Oz, the Great & Powerful. He shares his preparation, how he created the world of Oz with the costumes, and the challenging costumes. http://www.thefashionspot.com/celebrity-fashion/news/179155-costume-designer-gary-jones-talks-oz-the-great-and-powerful
Amazon has a few items that may aid you in your quest to re-create the costumes from Oz, the Great & Powerful: