As it happens, I was wearing an Italian Cycling Federation rain jacket.
Obviously, it was designed with the inherent dangers of eating Calzone while on the hoof in mind, as I was able to wipe off the remains of my lunch with a combination of ease and elan.
You see, Rapha would have invested money in researching technical fabrics that would have caused all that mess to slide off without leaving a trace.
#haveyouconsideredraphawearing