This was a plain shirt I picked up for $1.50.
I used a white T-Shirt that we got for free at some event for the fabric to make the flowers. Jersey is an easy fabric to use because it will not fray.
I took a three inch strip and cut a 2" slit every inch. Sew a basting stitch along the edge and gather.
Sew onto the neckline of your T-Shirt.
For the flower on the left I took a 2" strip and tied one end in a knot. Then twist the fabric as you wind it around the knot. Secure on the backside with thread.
For the flower on the right, cut out a 5" circle. Baste around the edge and gather. Tie the basting threads in a knot to secure. Flatten the flower so the gathers make the center of the flower. Cut 3 one inch circles and fold them in half twice. Sew these to cover up the raw edges in the center of the flower.
Sew them on your shirt.