A top that caught my eye on social media. You van unzip it, but add "collarbone" if you want it full unzipped from the top. (Last image is an example of how it looks without collarbone in the prompt)

You can also play with the keywords "Brown halter top with zipper" or just "brown halter top."

If from behind images I would drop the zipper part so it won't add one to her back.

Adding midriff and navel also helps.