Having said that by changing the shape of the ribbons for KIMONO/YUKATA gives you different impressions. But it could be tricky and some people even take lessons which you can learn how to tie and make ribbons.
There are pre-made ribbons so that anyone can enjoy wearing KIMONO/YUKATA easily. Thus ribbons are so popular especially among young girls.
Year by year more designs are sold and people get more chooses. Traditional Japanese clothes are adapted to people's needs.