I wanted a new shirt. So I made one. I saw something like this on a friend and filed it away for using later. Here's my version (Great Cheese Heather)
I took a plain shirt and sewed 1/4" tucks. Then I sewed the tucks opposite ways every 1 1/2" making "waves."
One sides the waves go from hem up over the shoulder and back down to the hem. The other side has shorter waves.
Today I wore it with a scarf.
It has enough detail to wear it alone, but it's not overwhelming when I wear it with an accessory.
I'm really happy with it. I think it looks so cool. One tip I would say to sewing on top of a knit shirt is using a stretch needle so no holes are created in the fabric. I've tried sewing with a universal needle on knit and it ruined the shirt.
This is the should that has smaller waves. See how they just seem to disappear?