The birds and hearts were copied from Sue's Tree House, cool designs for diverse uses.
This design was drawn up atop a linen handkerchief, embroidered, and ironed atop Wonder Under before being appliqued onto the blouse. The blouse was a very thin cotton, so adding the embroidered images helped with the "see-through" issue.
Here is a vest repurposed with appliques and embroidery:
This is a blog you might like to visit; it has lots of vintage items: Emmamyrtle's Blog.