Dress Help!

Alright, i have a military ball coming up to go to with my husband and we’ve never been to one before. I will be 8 months pregnant at that time but I do really want to go…We are also getting maternity pictures done also in September and I’m wanting to do a fall aethstetic one (so burnt orange/yellows/darker colors) since she’s due in October/November (her origional due date was Nov 1, but she’s growing pretty fast so aren’t going to be surprised if she makes her debut in October!). I’d like to get a dress I can use for both. The ball is a formal event, and he will be in navy blue (Air Force). Is this dress formal enough AND maternity picture worthy? And will it look okay with his navy blue? I added pictures of what his uniform looks like. Other options are welcome! Formal maternity dresses are so hard to find. Also-it will be late September in CO, expecting it to be kind of cold so it needs to be long sleeves.