Popsugar Celebrity The Royals Royal Wedding Traditions The 21 Traditions to Look Out For at a Royal Wedding February 12, 2018 by Marcia Moody View On One Page Photo 10 of 21 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 10 Male Guests in Military Uniform If they have never served in the military, then it's customary to wear a morning suit. Previous Next Start Slideshow The RoyalsCelebrity WeddingsWeddingsCelebrity Facts