Here's another tip from my MIL. If you are looking for looser leaves in a head of cabbage, like for stuffed cabbage, pay attention to its core. The larger the core (the bottom where they slice off) the looser the leaves.
How to Stop The Cabbage Butterfly (Pireis rapae)
Garden Insects: Imported Cabbage Worms
Foods I Can Eat After Having My Teeth Pulled
Keeping Turkey Hot and Juicy After Cooking?
Growing Chinese Cabbage