Love the label Katz with kittens on it. The color is a vibrant, cheerful yellow, best seen in the closeup photo. It has little scalloped edges and pink and blue flowers. In excellent condition, looks never worn. tag says small but seems closer to a medium. please see the measurements.
nylon
Measures

bust up to 38
hips 48
length 53

this could easily be cut off to a babydoll length

This item is sold from a vintage boutique in Austin, TX.