Just had a rad idea! What if you could make collar inserts? Sort of like dickies but without the faux shirt portion. I've found that a lot of the dresses that appeal to me to have Peter Pan collars. Wouldn't it be great if I could just pop one in when I felt in the mood? It might not perfectly come together in the back but would still look cute. Possibly attach with clips on one side?
Her version would work with crew neck shirts. Something with a tight neck.