Given the business world has turned more causal (bankers wear Patagonia vest, CEOs wear a hoody/sneakers), business casual is hard to navigate.
Quick primer: https://putthison.com/businesscasual/
There is something to be said about this being a time that management can try to envision you in the FDX uniform.
Dress so that your confidence is improved. How will you personally respond if you are in business casual and you are surrounded by guys/gals who are all suited? How will you personally respond if you are in a suit and everyone else is in slacks/button ups?
Some can just roll with it. I know that I’d be second-guessing myself more if I was underdressed than in a suit. Many of my friends would be more stiff in a suit, and their personality wouldn’t show as well. YMMV.