This seller has several versions of this smock style that has no ties:
https://www.etsy.com/listing/1677232...?ref=related-0
Seems like it would be fairly easy to make this with a couple of towels; would just need perhaps a commercial pattern that included the banding part. However, it doesn't meet the OP's criteria of a loop to go around the neck.
Maybe this one?
https://www.etsy.com/listing/1210172...w_type=gallery