Hi, I think you'll need 7/8" and 3/8" ribbon. I don't see the base bow in your photo, so not sure what size is the ribbon for the base bow. I like to make base bow with 1 1/2" but 7/8" is good, too. It's just a matter of personal taste.
For the bows in the photo, I think I'd make a top bow- butterfly fold or twisted boutique bow whatever you call it- with 7/8" which is lined with 3/8" in the middle to give it 2 tones look. Use fabric glue. Underneath is a 4 loops 3/8". and then spikes with 3/8" and 7/8".
To fix the layers together, I'd use hot glue, then I sew them together to secure. flower wire is an alternative.
HOpe this helps and have fun!