What I have found makes a great costume that are versatile and easy no sew/bit of sewing are hooded sweatshirts! Here are a few examples of the costumes my parent have made.
4 Calling Birds
The pictures above are from the performance we did of Randy and Jeff's Five Golden Rings. I buy adult size sweatshirts so that they are a bit baggy. This is helpful because then students can where leggings underneath and they feel a bit more covered. These were made using some cotton fabric from Joann's, felt, the sweatshirts and I also found a stiffer material for the beaks but I'm not sure what it is called. You can find it near the felt in Joann's. The fabric was used to create wings that attached along the bottom of the sleeve and then down the side of the sweatshirt.
These costumes are from our performance of Randy and Jeff's The Princeless Princess. They were made using the same materials as the other costumes. Both projects were no sew!