Here's how Marriott does it:
Sew the ends of two short strips (4") of hook/loop tape facing each other to each corner of the inside seam of the duvet cover. Add one more set at the middle of the top and bottom seams for a king size.
Then sew a loop of double-folded seam tape to the comforter in the matching positions.
Attach the hook/loop tape together through the comforter loops.
Sew large buttons at each corner of the comforter. Then on the inside of the duvet, attach elastic cord to slip over the buttons. Sometimes it is easier to make the cord a bit longer and just tie the loop for the buttom. Easy on/off for laundering
Bed, Bath & Beyond and similar stores sell special clips for this purpose, they're about $4 with a 20% off coupon. They work fine as long as you don't snuggle too much with the corners of the duvet.
I stitched lengths of ribbon to the inside corners of the duvet. I tie them securely around the corners of my comforter and it holds them in place. Just be sure the ribbon is a neutral color and/or machine washable so the ribbon color does not run and stain your cover.
I use to use 4 big safety pins and pin it at the corners. Or you could take a tapestry needle and go thru all the layers in the corners with a piece of yarn and tie it like a tied comforter/quilt. You can remove the yarn when you launder it.
I used a needle and thread to sew the 2 bottom corners and 1 in the middle (turn the duvet inside out first) it is easier to do it if there are 2 people.......good luck
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