I have been wanting to do some of these Japanese influenced costumes for a LONG time.
The belt is really a waist cincher with boning that laces up in the back. The waist ribbon and bow covers all that. I attach the bow with Velcro.
A good looking bow is no accident. It should be built bit by bit.
This is the magenta bow for the dress with the long over skirt. You can see the pieces for the peach bow in the upper left of this photo all ready to go for the lacy peach dress.
BUT, a circle skirt is not hard to figure out, if you want this version instead.
There are many, many, many tutorials on Youtube. Here is one I like. but if you don't. Go to Youtube.com and you will find lots more options.
The only thing different about how I made the circle skirt for this dress is I didn't make a folded hem. I used extra-wide bias tape along the hem line.