What jacket to wear with this dress

[Sparkygal]

I’m wearing this dress to a graduation next week but weather looks mixed. Don’t want it to look like a wedding outfit but also not too casual. Any ideas?
I am going for burgundy flat slingbacks and a burgundy bag. Thank you!

https://sarta-uk.com/products/8840strinb-striped?_pos=1&_psq=navy+striped&_ss=e&_v=1.0

From the same company:
https://sarta-uk.com/products/tatum-boyfriend-blazer-navy-blue-jersey

Or for a more casual look:
https://www.lilyandmeclothing.com/collections/coats-jackets/products/seren-stretch-cotton-twill-jacket-white

Thank you! I found a black boucle blazer in my wardrobe I forgot I had so will wear that if it rains otherwise going jacketless. Thanks for the suggestions though