Materials you will need:

2 Queen sized flat sheets or enough material to for two sides (about 86″ x 88″)

6-10 buttons (your preference!)

Thread that matches your fabric/sheets

Directions:

If you are using two Queen sized flat sheets you do not need to measure since they are the perfect size for a duvet cover (86″ x 86″).  If you are using fabric of your choice, measure and cut to be 86″ x 88″.  From here on out, I will refer to the two sides of the duvet cover as panels.  Lay the panels one on top of the other, with the sides you want to show facing each other.  Pin the panels together on three sides, leaving the fourth side open.  This fourth side should be one of the short sides (86″).  You are ready to sew! 

Inset your needle about an inch away from where the two fabric panels meet and sew done the sides, making sure to reverse the needles direction at the top and bottom of the side for reinforcement.  By insetting your needle an inch, your final cover will measure 84″ x 84″. 

Once all three sides are sewn, it is time to sew the buttons on the fourth, open side.  You will want to turn your fabric right side outward and sew your buttons on the side you want to show.  I used six buttons, but you can use as many as you want depending on the size gaps you want on the closure.   Evenly space your buttons and mark their placement on the fabric.  Sew them on and cut your slits so that you can tuck your fabric inside when closed.    The slits will fit over the buttons so you can “close” your duvet and your comforter won’t fall out.  You don’t want to make the slits too big, or your closure will constantly come undone. If you did these last few step correctly, you will not see the buttons or the slits when the duvet is buttoned up because they are on the inside. If you have the right attachments for your sewing machine, you can always use that to make your button holes instead.  Well, that is it!  Very simple and it takes about 40 minutes.