I've made several of these baby cocoons. The crochet pattern is simple and quick enough to whip up a day before a photo shoot.
Crocheted Football Baby Cocoon & Hat - Free Online Pattern including a link to a video on the "Magic Circle" (Magic Circle - the best way to start anything in rounds - if it's closed, anyway). - (Pattern Copied to text file and photo - SLT)
Crochet Baby Cocoons All The Cutest Ideas You'll Love
Crochet Baby Cocoons The Most Adorable Collection | The WHOot