Proper leather shoes

Rules. I hate rules and rarely follow them. But am I chancing too much by partnering these tan beauties with black trousers ? It's for a wedding where I'm the groom. Dark grey jacket/black shawl lapel, black trousers and the Grensons.The whole world and his wife say no but what does a cycling forum think ?
http://www.grenson.co.uk/stanley-287

colours aside, that's quite a chunky shoe for a suit

that said, do what you feel like, it's your wedding