Believe it or not, I could not find 1" or wider grosgrain, so I went with the flattest 2-hole buttons I could find for the inside. It they support the large main buttons very well, and keep the thread & knitting ripping from the weight of the large buttons, but I hope that they will not catch on my clothing this way.
Time will tell.
How come things never look on me the way they do on the illustration pictures? (Guess because I don't have a fitter with pins to force it to look good just for the pictures...)