Elizabeth, that is very pretty. I made a long kimono just last week! I used a very old Louise Cutting pattern called East Meets West* for a wool challis in a panel print from Emma One Sock that I suspect was supposed to be for scarves. (The lines between panels was subtle, so it worked.) It is past my knees, and I plan to wear it to performances. I can wear it to the symphony w/ a silk shirt & nice pants, or to more casual events w/ jeans & a T-shirt. It is so lightweight that it will be just perfect for our foggy summer nights, which probably guarantees a heat wave during every performance we're attending this summer & fall.
Another good pattern is Grainline Studio's Morris Blazer. I haven't made it yet, although I am cutting one out this week, but I've seen it on others and it is very cute and casual. http://shop.grainlinestudio.com/collections/morris
* The sleeves are huge on this, it is like a traditional kimono. Eating dinner is going to be problematic, and I wouldn't use this pattern for a work-related garment. It was perfect for the panel prints, because the pattern has no side seam-the front & back are one giant piece. I cut it on the crossgrain & the lines between the panels make a nice vertical line on either side of the front. (I made sure the panel was folded exactly in half before cutting, so the line would be in the same place on each side.)