Well, my husband and I are going on the September 1st Holiday as well. You are the first person I have run into on multiple boards going this same time! Wow, what a relief that we won't be alone!
My husband was reluctant also. But I swayed him into agreeing to wear the coat on the two formal nights. Just use your powers of persuation!
Are you an entire family going?
My last carnival cruise, a gentleman was told if he did not have a coat, they would get one for him from the pursers desk to use during dinner. I think he and his family just went to the pizza bar instead!