This is my almost 6 year old on her first Halloween.
I had big plans for a daffodil costume, but the white weed that you blow and make a wish on, not the yellow one. But every time I explained it I just got weird looks so I went simpler with a plain flower.
The petals were supposed to stay on her head like a headband but she was 10 months and I am lucky she even kept them around her head.
I sewed on 2 leaves to her onesie (which would have looked a little more like leaves if the petals were on her head) and then made a skirt to imitate grass. I cut up sheer fabric and tied some crazy yarn to it.