TODAY: The solution. No sew, took me ten minutes, so far it has worked and I am in LOVE!
One set of sticky, no-sew Velcro dug out of my stash!
Hard to tell what is going on here because this part of my cover also happens to be white but the under part with the previously mentioned sticky Velcro is on the comforter. The top is the duvet COVER with the soft part of the Velcro attached. I did this on all FOUR corners on both sides of the comforter (topside and underside) and all four corners of the cover to match. That is 8 hook Velcro tabs on the duvet and 8 loop Velcro tabs on the duvet cover.
This one is easier to see what is going on. Grey is cover. White is comforter. Put the soft tabs on the part that is going to get washed (the cover) the scratchy tabs on the part that will always remain on the bed (feather part).
Now stick your comforter down inside of the cover so that all four corners match up. (Don't try to take a junky picture of it because as you can see... nothing but a fabric mess going on in this shot!)
There's the flash. See, corner inside cover!
This is a look at is when it is first going together so you can see all tabs in one corner.
Seriously, at this point I should have taken a shot of the whole lovely bed but WRINKLES, my goodness, wrinkles... next time I'll iron it then blog about it. Ha ha, yeah right!