For this duvet I used a preruffled fabric from Ruffle Fabric in Navy 2" ruffle with white stripe. She has some new peppermint ruffle fabric that to die for. I'm kind of glad she doesn't have it in blue and white because I might lamented missing out on it.
Love love love her stuff! Ruffle fabric makes for great instantly amazing projects. Use for pillows, curtains, even clothes! Some other items you should check out are her white ruffled maze fabric, blue bell cascading ruffled fabric and 2" taupe ruffled fabric.
For my king sized bed I used 6 yards of ruffle fabric and a king duvet insert from JoAnn's that was on sale for $20. For the back of the duvet I used a king sized 650 thread count sheet and as a fold-down contrast I used a vintage floral twin sized sheet with similar colors in the room.
I also made decorative pillow for the bed. I bought the pillows at the thrift store for just $1 each. I found some AMAZING satin teal diamond pleated material from Hancock Fabric for only $7! I'm thinking of going back and buying the rest of it.
You can't see them very well but I also purchased pink deco fabric from JoAnn's and covered two small rectangle pillows. The pink was a nice accent to the pink in the curtains and the contrast fold over vintage sheet.
It all looks very Anthro/Urban Outfitters to me. And I made it for a fraction of the price. I love it. Brian loves it. And most importantly, Molly loves it. If you want to make a duvet for your bed here are my suggestions for yardage based on bed size:
Twin: 66 x 96 inches- 3.75 yards
Full: 81 x 96 inches- 4.5 yards
Queen: 90 x 102 inches- 5 yards
King/California King: 108 x 102 inches- 6 yards
You'll have to cut your yardage in half and sew them together lengthwise.