Working or visiting an environment that requires a business dress code leaves little room for your personality to shine. Weddings often require tuxedos or business suits where you need to look fashionable and attractive. If your life revolves around wearing extravagant clothing or the necessity of cuff links, then you might feel a bit strangled by convention.
As a groomsman at a wedding your groom might not care for individuality that screams. A flashy tie draws notice, yet something too expressive might create the wrong impression. This leaves you with only a few choices such as wearing fun socks or cuff links.