Safety pin boas to your pink shirt. Start by lining the neckline of the shirt all the way around, securing it with safety pins where you see fit. (This is not an exact science!)
You can cut your boas into smaller pieces or keep them all in one piece. Keep adding boas and pinning them until your shirt is pretty well covered on the front. This is easiest to do when you are wearing the shirt so you can see how the boas hang.
Add boas to the back of the shirt as well.
Bobby pin some of the extra feathers that have inevitably fallen off the boas to the front of your hair.
How to Make a Felt Flamingo Beak
Cut a piece of black felt into a triangle shape.
Fold the front part down on the corners about half way up, kind of like you fold wrapping paper when you're wrapping a present.
Hot glue the folds so it stays in place.
Add double-sided tape to the top and attach to your nose.
Notes
I didn't tie dye these pants, I bought them that way, but if you want to re-create them you can buy a tie dye kit or use Rit dye in petal pink to tie dye some white jeans. Alternatively, wear some pink or black leggings.