I don't know if it's historically traditional or whomever popularised it, but I think, IMHO, that wearing a black bow tie with a wing collar just looks plain dumb and I would never do it. The black band visibly running around the neck looks like a bad combination of "ring-around-the-collar" and wearing ones trousers so low that the underwear's waist band is on display. Plus, it gets even worse when the wearer's bowtie is an adjustable and hence has a shiny metal ring on the band. Just ick. Maybe it's just me, but, um, ick. YMMV.