Wedding recommendation

Hey all! I’m going to my cousins wedding, dresscode is business casual. I already have some pants ready to go but I’m not sure what goes well with this. I’m thinking maybe a marine blue shirt? And maybe black loafers, if they’re in my size (im a size 15 and sizes in NL tend to be low) would milky white sneakers otherwise work as well? Any advice would be great, im struggling rn haha